Magnetic resonance imaging device

专利摘要:
APPARATUS FOR MAGNETIC RESONANCE IMAGING. The present invention relates to a magnetic resonance imaging (MRI) apparatus that includes a housing having an orifice to which a magnetic field for use in an MRI scan is applied, a movable table on which an inspection target can be be placed and which enters the hole of the housing, a projector that projects an image onto an internal wall that forms the hole of the housing, and a controller that controls the projection unit and transmits a video signal to the projector.
公开号:BR112015010164B1
申请号:R112015010164-0
申请日:2013-10-30
公开日:2022-01-25
发明作者:Myung-Kyu Lee
申请人:Samsung Electronics Co., Ltd；
IPC主号:

专利说明:

FIELD OF TECHNIQUE
[0001] Exemplary embodiments relate to magnetic resonance imaging (MRI) apparatus and, more particularly, to an MRI apparatus capable of displaying an image within an MRI apparatus hole. BACKGROUND TECHNIQUE
[0002] Magnetic resonance imaging (MRI) devices are imaging devices that are used to perform a medical diagnosis and that visualize the cross-sections of internal structures of a human body. An MRI device includes a main magnet that is used to apply a strong magnetic field to a human body, a gradient coil that is used to apply a gradient magnetic field to provide local information of a magnetic field, and a radio frequency coil ( RF) which is used to apply electromagnetic waves to a human body so that a magnetization vector resonates inside the human body and to receive a magnetic resonance signal from the human body. The main magnet, gradient coil, and RF coil used to perform an MRI scan are housed in a housing, which is a cylindrical-shaped structure that has a hole in which an inspection target is arranged.
[0003] However, during an MRI scan, since the hole of an MRI apparatus in which an inspection target is placed is a relatively narrow, closed space, it is highly likely that the inspection target will feel bored and , so it moves during a long sweep. When an inspection target moves frequently, an image that is obtained through an MRI scan may be of poor quality and thus content to reduce the boredom of the inspection target during the scan needs to be provided. For this purpose, a virtualization system that provides video data to an inspection target during an MRI scan has been proposed. As an example of the virtualization system, a method has been proposed to provide video data to an inspection target by allowing the inspection target to wear glasses in which an image is displayed or by allowing the inspection target to see an image. image that is displayed outside the housing through a mirror installed inside the hole. However, the glasses method can cause inconvenience to an inspection target due to the proximity of glasses in which an image is displayed and the mirror method can degrade the quality of an image. DISCLOSURE OF THE INVENTION TECHNICAL PROBLEM
[0004] Exemplary embodiments provide a magnetic resonance imaging (MRI) apparatus that is capable of displaying an image within a hole of the MRI apparatus while reducing the inconvenience of an inspection target. SOLUTION TO THE PROBLEM
[0005] In accordance with one aspect of one or more exemplary embodiments, an MRI apparatus is provided that includes a housing that includes an orifice that is configured to receive an applied magnetic field for use in an MRI scan; a movable table which is configured to provide placement of an inspection target and to enter the hole in the housing; a projector that is configured to project an image onto an internal wall of the housing that at least partially forms the hole in the housing and a controller that is configured to control the projector and to transmit a video signal to the projector.
[0006] The inner wall of the housing can be curved into a substantially cylindrical formation. The substantially cylindrical formation denotes not only a completely cylindrical structure, but also a partially cylindrical structure. Alternatively, at least a part of the inner wall of the housing may be flat and the projector may be further configured to project an image flat on at least part of the inner wall.
[0007] The MRI apparatus may additionally include a correction processor that is configured to process a signal referring to the image that is to be projected by the projector, such that an image distortion due to curvature and/or tilt of the inner wall of the housing is substantially deflected as a result of the signal processing. Distortion can include a curved surface distortion due to the curve of the interior wall of the housing or a skewed distortion due to an oblique image projection. Deviation can be prior distortion due to the fact that it is generated in advance to deflect curved surface distortion or skew distortion. The correction processor can be further configured to adjust an amount of deviation that results from signal processing based on a change in a direction in which the projector projects the image.
[0008] The projector may include a projection direction converter that is configured to convert a direction in which the projector projects the image.
[0009] The projector may include a drive module that is configured to apply a drive force to the projection direction converter such that the direction in which the projector projects the image is changed. The controller can be further configured to control the drive module such that the direction in which the projector projects the image is changed based on at least one of a posture direction and a direction facing the inspection target that corresponds to a user manipulation.
[0010] The projector may include a drive module that is configured to apply a drive force to the projection direction converter such that the direction in which the projector projects the image is changed and a local tracking sensor that is configured to capture at least one of a laying direction and a direction facing the inspection target. The controller can be further configured to control the drive module such that the direction in which the projector projects the image is changed based on at least one of the posture direction and the direction toward the inspection target that is captured. by the local tracking sensor.
[0011] A location on the inside wall of the housing on which the image is projected may change based on a location of the movable table within the hole of the housing when the movable table enters the hole of the housing.
[0012] The projector may include an illumination sensor that is configured to control a beam brightness of the image that is projected by the projector based on a state of an illuminance within the hole.
[0013] At least part of the projector can be mounted on the movable table.
[0014] The projector may include a beam projector which is disposed at at least one end of the movable table with respect to a longitudinal direction of the movable table.
[0015] The projector may additionally include a detachable module which is mounted on the movable table and to which the beam projector is detachably attached.
[0016] The detachable module may include a first detachable sub-module and a second detachable sub-module, wherein the first detachable sub-module is disposed at a first end of the movable table with respect to the longitudinal direction and the second detachable sub-module is disposed at a second end of the movable table that is opposite the first end of the movable table with respect to the longitudinal direction.
[0017] Each of the first detachable submodule and the second detachable submodule may include a respective connection terminal that is configured to transmit power and a video signal that is received from the controller to the beam projector and a respective detachable sensor that is configured to capture a beam projector fixture or detachment. The controller can be further configured to supply power and video signal to only one sub-module to which the beam projector is attached between the first detachable sub-module and the second detachable sub-module, based on respective information referring to the respective attachment or to the respective beam projector detachment found by each respective detachable sensor.
[0018] The detachable module may include a projection direction converter that is configured to convert a direction in which the projector projects the image.
[0019] The beam projector may include an optical engine engine module that is configured to project an image, wherein the projection direction converter is additionally configured to convert a direction in which the optical engine engine module projects the image.
[0020] The beam projector may include an illuminance sensor that is configured to control a brightness of a beam from the beam projector based on a state of an illuminance within the hole.
[0021] The beam projector may include a light source driver that is configured to supply constant voltage power that has a constant level to a light source. The light source driver may include an adjustable regulator which is configured to transform an input power into a preset constant voltage and to output the preset constant voltage, wherein the adjustable regulator does not comprise inductors; a constant voltage controller that is configured to control an output of constant voltage power that corresponds to the preset constant voltage emitted by the adjustable regulator and a current sensor that is configured to sense a current supplied to the light source and to transmit information that refer to a magnitude of current found for the constant voltage controller.
[0022] The beam projector may additionally include a heat dissipation module that is configured to dissipate generated heat. The heat sink module may include a heat sink that is formed from a non-magnetic material.
[0023] The projector may include a beam projector that is installed outside the hole in the housing and a reflection mirror that is configured to reflect a beam of light from an image projected by the beam projector onto the inside wall of the housing.
[0024] The beam projector can be configured to project a collimated beam of light.
[0025] The reflection mirror can have an aspherical reflecting surface or a flat panel type reflecting surface, on which the surface is configured to magnify the beam of light projected by the beam projector to have a wide angle.
[0026] The MRI apparatus may additionally include a support which is configured to movably support the movable table and the beam projector can be arranged on the support.
[0027] The MRI apparatus may additionally include a detachable beam projector module which is mounted on the movable table and to which the beam projector is detachably coupled.
[0028] The detachable beam projector module may include a first detachable sub-module and a second detachable sub-module, wherein the first detachable sub-module is disposed at a first end of the support with respect to the longitudinal direction and the second detachable sub-module is disposed in a second end of the support that is opposite the first end of the support with respect to the longitudinal direction.
[0029] The reflection mirror can be arranged on the movable table.
[0030] The projector may additionally include a detachable reflection mirror device which is arranged on the movable table and through which the reflection mirror is detachably coupled to the movable table; and a detachable beam projector module which is mounted on a support which is configured to movably support the movable table and to which the beam projector is detachably coupled.
[0031] The detachable reflection mirror device may include a first detachable device and a second detachable device which are respectively disposed at both opposite ends of the movable table with respect to the longitudinal direction. The detachable beam projector module may include a first detachable sub-module and a second detachable sub-module which are respectively disposed at both opposite ends of the support with respect to the longitudinal direction.
[0032] The reflection mirror can be arranged inside the hole in the housing.
[0033] The projector may include a fiber optic projector, wherein the fiber optic projector includes a video unit that is disposed outside the hole in the housing, a fiber optic cable unit that is configured to transmit a beam of light of an image produced by the video unit and a projection lens unit that is configured to project the light beam of the image received through the fiber optic cable unit onto the inner wall that at least partially forms the hole in the housing.
[0034] The projection lens unit can be arranged on the movable table.
[0035] The projector may additionally include a detachable projection lens unit device which is disposed on at least one of both opposite ends of the movable table with respect to the longitudinal direction, and to which the projection lens unit is coupled in a detachable manner and a detachable video unit module which is mounted on a support which is configured to movably support the movable table and to which the video unit detachably attaches.
[0036] The projection lens unit detachable device may include a first detachable device and a second detachable device which are respectively disposed at both ends of the movable table. The detachable video unit module may include a first detachable sub-module and a second detachable sub-module which are respectively disposed at both opposite ends of the support with respect to the longitudinal direction.
[0037] The image that is projected may include at least one of an MRI scan image, scan information, and moving picture contents.
[0038] In accordance with another aspect of one or more exemplary embodiments, there is provided a method for displaying an image into an orifice of an MRI apparatus, wherein the method includes causing a movable table on which an inspection target is disposed to enter a hole in a housing to which a magnetic field for use in an MRI scan is applied and project an image onto an inner wall of the housing, in which the inner wall at least partially forms the hole in the housing.
[0039] The method may further include deflecting a distortion of the projected image in which the distortion is due to a curvature and/or a slope of the inner wall of the housing by performing signal processing in relation to a signal referring to the image.
[0040] The method may additionally include changing a direction in which an image is projected onto the inside wall of the housing and adjusting an amount of deviation based on changing the direction in which the image is projected.
[0041] Projecting the image onto the inner wall of the housing may include starting the projection at a point in time when the movable table enters the hole in the housing. Alternatively, projecting the image onto the inside wall of the housing may include starting the projection at a point in time when an inspection target head enters the hole in the housing.
[0042] A point in time at which the image is projected onto the inner wall of the housing may vary with respect to a selection between a first arrangement in which a head of the inspection target is oriented towards the hole of the housing and a second arrangement in the housing. which the legs of the inspection target are oriented towards the hole in the housing. For example, with respect to the first arrangement, image projection onto the inner wall of the housing can start at the moment the inspection target's head enters the hole in the housing. Regarding the second arrangement, the image projection on the inner wall of the housing can start at the moment the neck of the inspection target enters the hole of the housing.
[0043] The method may additionally include changing a direction in which the image is projected, based on at least one of a posture direction and a facing direction of the inspection target.
[0044] A location on the inside wall of the housing on which the image is projected may change based on a location of the movable table within the hole of the housing when the movable table enters the hole of the housing.
[0045] A beam brightness of the projected image can be controllable based on a state of an illuminance within the hole.
[0046] Projecting the image onto the inner wall may include mounting a beam projector on the movable table; and projecting the image onto the inner wall of the housing by triggering the beam projector when the movable table enters the hole in the housing.
[0047] Projecting the image onto the inner wall may include arranging a beam projector outside the hole in the housing; mount a reflection mirror on the movable table; and projecting the image on the reflection mirror so that the image is reflected toward the inner wall of the housing, the beam projector operating as the movable table enters the hole in the housing.
[0048] The beam projector can project a collimated beam of light.
[0049] Projecting the image onto the inner wall may include arranging a video unit outside the hole in the housing; mount, on the moving table, a projection lens unit that is connected to the video unit through a fiber optic cable unit and transmit an image to the projection lens unit through the fiber optic cable, driving the projector from beam when the movable table enters the hole of the housing and project the received image onto the inner wall of the housing using the projection lens unit. ADVANTAGEOUS EFFECTS OF THE INVENTION
[0050] MRI devices according to the exemplary modalities can enable an inspection target that is scanned to see various contents (e.g. a moving picture, a picture, scan status information (e.g. , scan time information, scan guide information and scanned area information) and information for use in MRI), and can display high quality images by displaying an image inside the hole by implementing a projection method. BRIEF DESCRIPTION OF THE DRAWINGS
[0051] The above features and other features and advantages of the present concept of the invention will become more evident by describing in detail the exemplary embodiments thereof with reference to the accompanying drawings in which:
[0052] Figure 1 is a schematic diagram of a magnetic resonance imaging (MRI) apparatus, according to an exemplary embodiment;
[0053] Figure 2 is a block diagram of an in-hole display device of the MRI apparatus of Figure 1, according to an exemplary embodiment;
[0054] Figure 3 is a block diagram of an MRI control system of the MRI apparatus of Figure 1, according to an exemplary embodiment;
[0055] Figure 4 is a block diagram of a detachable beam projector module of the MRI apparatus of Figure 1, according to an exemplary embodiment;
[0056] Figure 5 is a block diagram of a beam projector of the MRI apparatus of Figure 1, according to an exemplary embodiment;
[0057] Figure 6 is a block diagram of a constant voltage control circuit of a light source driver of the beam projector of Figure 5;
[0058] Figures 7, 8 and 9 illustrate an operation of the MRI apparatus of Figure 1;
[0059] Figure 10 is a schematic diagram of an MRI apparatus, according to another exemplary embodiment;
[0060] Figure 11 is a schematic perspective view of a detachable module used in the MRI apparatus of Figure 10;
[0061] Figure 12 is a block diagram of the detachable module of Figure 11;
[0062] Figure 13 illustrates an operation of the MRI apparatus of Figure 10;
[0063] Figure 14 is a diagram illustrating a curved surface distortion of an image projected on the MRI apparatus of Figure 10;
[0064] Figure 15 is a diagram illustrating a skewed distortion of an image projected on the MRI apparatus of Figure 10;
[0065] Figure 16 is a schematic diagram of an MRI apparatus, according to another exemplary embodiment;
[0066] Figure 17 is a schematic diagram of an MRI apparatus, according to another exemplary embodiment;
[0067] Figure 18 illustrates a display operation in the hole of the MRI apparatus of Figure 17;
[0068] Figure 19 is a schematic diagram of an MRI apparatus, according to another exemplary embodiment; and
[0069] Figure 20 is a schematic diagram of a fiber optic projector of the MRI apparatus of Figure 19. MODE FOR THE INVENTION
[0070] The present concept of the invention will now be described more fully with reference to the accompanying drawings, in which exemplary embodiments are shown. The present concept of the invention may be incorporated, however, in many different ways and should not be interpreted as being limited to the exemplary embodiments presented herein; rather, these exemplary embodiments are provided so that this disclosure will be exhaustive and complete and will fully convey the concept to those skilled in the art. The scope of the present inventive concept is defined only in the claims. Throughout the specification, reference numbers or similar characters refer to similar elements.
[0071] The terminology used in the present document will be briefly described now as the exemplary embodiments will be described in detail based on that terminology.
[0072] Although the general terms widely used in the present have been selected to describe the exemplary modalities in consideration of their functions, these general terms may vary according to the intentions of an individual of common skill in the art, case precedents , the advent of new technologies and the like. Terms arbitrarily selected by the applicant may also be used in a specific case. In this case, their meanings need to be given in the detailed description. Consequently, terms should be defined based on their meanings and the contents of the full descriptive report, not just simply stating the terms.
[0073] The terms "comprises" and/or "which comprises" or "includes" and/or "which includes", when used in this descriptive report, specify the presence of stated elements, but do not exclude the presence or addition of one or plus other elements.
[0074] The terms "~drive" or "~er" as used herein mean, but are not limited to, a software or hardware component, such as a Field Programmable Gate Array (FPGA) or an integrated circuit of specific application (ASIC) that perform certain tasks. However, the term "~drive" or "~er" is not limited to software or hardware, but can be configured to reside on an addressable storage medium and configured to run one or more processors. Thus, the term "~ unit" or "~er" may include, by way of example, object-oriented software components, class components and task and process components, functions, attributes, procedures, subroutines, segments of a program code, drivers, firmware, a microcode, a circuit, data, a database, data structures, tables, matrices and variables. Functions provided by components and units can be combined into a smaller number of components and units or can be further separated into additional components and units.
[0075] Exemplary embodiments are described in detail herein with reference to the accompanying drawings so that such disclosure may be readily accomplished by an individual of ordinary skill in the art to which the exemplary embodiments pertain. The present concept of the invention can be incorporated, however, in many different ways and should not be interpreted as being limited to the exemplary embodiments presented herein. In the drawings, parts irrelevant to the description are omitted for simplicity of explanation.
[0076] Expressions such as "at least one of", when it precedes a list of elements, modifies the entire list of elements and does not modify the individual elements of the list.
[0077] In the entire descriptive report, a "user" may be a medical specialist, such as a physician, nurse, health care technician, or medical imaging specialist, or may be an engineer who manages medical devices; however, exemplary embodiments are not limited thereto.
[0078] Figure 1 is a schematic diagram of a magnetic resonance imaging (MRI) apparatus 100, according to an exemplary embodiment. Figure 2 is a block diagram of an in-hole display device of the MRI apparatus 100 of Figure 1, according to an exemplary embodiment.
[0079] Referring to Figures 1 and 2, the MRI apparatus 100 includes a magnetic field generating unit (not shown) for performing an MRI that is installed within a housing 110 and an MRI control system 180 that applies power to the magnetic field generating unit and controls the magnetic field generating unit. The MRI 100 apparatus enables a user to manipulate the MRI 180 control system via a console 190 which is supplied outside the MRI 100 apparatus and display a magnetic resonance image produced via the console 190. The field generating unit magnet that is accommodated within housing 110 includes a main magnet that is used to apply a strong magnetic field to a human body, a gradient coil that is used to apply a gradient magnetic field to provide local information that refers to a magnetic field. magnet and a radio frequency (RF) coil which is used to apply an electromagnetic wave to a human body so that a magnetization vector resonates inside the human body and receives a magnetic resonance signal from the human body. The magnetic field generating unit for performing MRI is well known in the art and does not limit exemplary embodiments.
[0080] Housing 110 is a cylinder, i.e. a substantially cylindrical structure, which includes an orifice. A table 120, on which an inspection target is arranged, is inserted into the hole. The cylinder denotes not only a completely cylindrical structure, but also a partially cylindrical structure. Reference numeral 110a indicates an inner wall that at least partially forms the hole of housing 110. As will be described later, inner wall 110a of housing 110 functions as a viewfinder for a beam projector 160.
[0081] The table 120 includes a movable table 121 that enables an arranged inspection target to be automatically moved in the hole of the housing 110, a support 122 that movably supports the movable table 121 and a table drive unit 125 that drives a movement 126 of the movable table 121 under the control of the IRM control system 180.
[0082] The beam projector 160, which projects an image into the hole of the housing 110, a detachable module 150, to and from which the beam projector 160 is attachable and detachable, and the IRM control system 180, which controls the beam projector 160, and the detachable module 150, constitute the in-hole display device.
[0083] Detachable module 150 is installed on movable table 121 and beam projector 160 is detachably attached to detachable module 150. A coupling portion of detachable module 150 that attaches to beam projector 160 may be attached using whether a connector or dock, which is commonly known in the art.
[0084] Detachable module 150 may be disposed adjacent the head of an inspection target which is seated on table 120 in order to be scanned. The inspection target head location can be varied based on scanning purposes. Thus, the detachable module 150 may include a first detachable sub-module 150-1 and a second detachable sub-module 150-2 which are respectively arranged at both opposite ends of the movable table 121 with respect to the longitudinal direction, so as to cover the two directions. in which the inspection target is arranged. The first detachable submodule 150-1 and the second detachable submodule 150-2 may have the same components. In the description below, the detachable module 150 may be called either the first detachable sub-module 150-1 or the second detachable sub-module 150-2. Each of the first detachable sub-module 150-1 and the second detachable sub-module 150-2 may not only allow the beam projector 160 to be detachably attached thereto, but may also perform a function of a power-transmitting connector, a video signal and a control signal that are supplied from the IRM control system 180, which is installed outside the housing 110, to the beam projector 160. Furthermore, each of the first detachable submodule 150-1 and the second detachable submodule 150-2 may include a detachable sensor 153 as illustrated in Figure 4, which captures a fixture or detachment of beam projector 160 in order to transmit information regarding a fixture or detachment of beam projector 160 to the IRM control system 180. Information referring to a fixture or detachment of the beam projector 160 will be referred to as fixture/detachment information from now on.
[0085] Beam projector 160 projects an image. Beam projector 160 can be attached to (i.e., docked to) one of the first detachable sub-module 150-1 and the second detachable sub-module 1502. When movable table 121 is inserted into the hole of housing 110 with beam projector 160 attached to both the first detachable sub-module 150-1 and the second detachable sub-module 150-2, the beam projector 160 projects a beam of light from an image onto the inner wall 110a, which forms the hole. In particular, the inner wall 110a of the housing 110 serves as a viewfinder for the beam projector 160.
[0086] Figure 3 is a block diagram of the IRM control system 180, according to an exemplary embodiment. Referring to Figures 2 and 3, the MRI control system 180 includes a signal processor 185 for projection, which processes a control signal to control the detachable module 150 and the beam projector 160, which forms the display device in the orifice and a video signal which is fed to the beam projector 160. The signal processor 185 for projection may be a part of a signal processing unit which controls various units of the MRI apparatus 100 and processes magnetic resonance images. The video signal that is processed by the signal processor 185 for projection may include various contents that can ease the strain of an inspection target and provide useful information to the inspection target during an MRI scan. Such content may include content such as any one or more of a moving picture, a picture, scan state information (e.g., scan time information, scan guide information, and scanned area information), and information for use when performing an MRI.
[0087] The IRM control system 180 may additionally include a video switch 181, which switches a video signal transmission path and the control signal to either the first or second detachable submodule 150-1 or 150- 2 to which the beam projector 160 is attached, and a power switch 182, which switches a projector power transmission path to either the first or second detachable submodule 150-1 or 150-2 to which the beam projector beam 160 is fixed. The signal processor 185 includes a central processing unit (CPU) 186, where the CPU 186 can generate a video switching control signal and a power switching control signal based on the pinning/detaching information received from the signal processor. detachable module 150 and can control the operations of video switching 181 and power switching 182 based on the generated signals. If beam projector 160 is attached to first detachable sub-module 150-1, first detachable sub-module 150-1 can transmit first attach/detach information to MRI control system 180. If beam projector 160 is attached to the second detachable submodule 150-2, the second detachable submodule 150-2 can transmit second attachment/detach information to the IRM control system 180.
[0088] Figure 4 is a block diagram of the detachable module 150. The detachable module 150 of Figure 4 may include either one or both of the first detachable sub-module 150-1 and the second detachable sub-module 150-2.
[0089] Referring to Figures 2 and 4, the detachable module 150 includes a data connector 151 that is configured to transmit a video signal and a control signal, and a power connector 152. The detachable module 150 may additionally include the detachable sensor 153. The detachable sensor 153 captures a fixture or detachment from the beam projector 160 and transmits attachment/detachment information to the IRM control system 180 so that the IRM control system 180 can check for which among the first and second detachable submodules 150-1 and 150-2 the beam projector 160 has been fixed. The data connector 151 or the power connector 152, rather than the detachable sensor 153, can detect a change in a signal that is fed back, and thereby can determine which of the first and second detachable submodules 150- 1 and 150-2 the beam projector 160 was fixed. As described above, the IRM control system 180 can allow the video signal/control signal and power to be supplied to one of the first and second detachable submodules 150-1 and 150-2, based on the fixture information. /detachment.
[0090] Figure 5 is a block diagram of beam projector 160, according to an exemplary embodiment. Referring to Figures 2 and 5, beam projector 160 includes a video signal receiver 161, a CPU 162, a beam-projection controller 165, a light source driver 166, a light source 167, a panel 169, a projection lens 170 and an illumination lens 171. When receiving video data from the IRM control system 180, the video signal receiver 161 transmits the video signal to the beam projection controller 165 The beam-projection controller 165 converts the video signal to a beam-projection video signal and then transmits the beam-projection video signal to the image panel 169. The image panel 169 may include a commonly known imaging panel, such as a transmissive liquid crystal display (LCD) panel or a reflective micro digital mirror device (DMD) panel. The beam projection controller 165 also transmits to the light source trigger 166 a light source trigger signal that corresponds to the video signal for beam projection. The CPU 162 included in the beam projector 160 controls the video signal receiver 161 or the light source trigger 166 based on the control signal received from the detachable module 150 and a series of pieces of control data that are stored in a memory 163. Beam projector 160 may additionally include a power converter 164 which converts power into power segments having respective sizes that are suitable for various units of beam projector 160. Image panel 169 forms an image based on the video signal for beam projection. When the light source 167 is triggered in accordance with the trigger signal received from the light source, a beam of light that is illuminated to the image panel 169 through the illumination lens 171 is modulated based on the image that is formed on the image panel 169 while being transmitted or reflected by image panel 169, and projected through projection lens 170. Projection lens 170 is manually or automatically brought into focus so that a beam of light from the projected image forms an image. on the inner wall 110a of the housing 110.
[0091] The beam projector 160 may additionally include an illuminance sensor 168 that captures an illuminance inside the hole of the housing 110. In this case, the information regarding the illuminance inside the hole that is verified by the The illuminance sensor 168 can be transmitted to the light source driver 166 so that the light source driver 166 can adjust the brightness of the light source 167 when driving the light source 167. For example, the brightness of the light source 167 light source 167 can vary based on the depth of the hole in the housing 110. Accordingly, the brightness of the light source 167 can be controlled based on a depth at which the movable table 121 enters the housing 110. In particular, as As the position of an image formed on the inner wall 110a of the housing 110 changes, the amount of light of an image projected by the beam projector 160 varies, so that the brightness of the projected image can be maintained at a consistent level. moment.
[0092] Due to the fact that heat is generated by the light source 167 and the like while the beam projector 160 is powered, the heat generated in the beam projector 160 can sensitively affect the inspection target. Accordingly, the beam projector 160 is arranged to be separated from the head of the inspection target by a predetermined distance. Beam projector 160 may additionally include a heat dissipating member (not shown). Commonly known structures such as a heat sink and a heat sink fan can be used as the heat sink member. When an electromagnetic motor to drive a heat dissipation fan is used, electromagnetic shielding may be required when applying a high magnetic field into the hole in housing 110.
[0093] Due to the fact that images for projection have different resolutions and different sizes, the beam projection controller 165 may include a scaler to perform signal processing scaling in order to scale the received video signal according to a beam projection format (e.g. any one or more of a resolution, an image size, and the like). When the console 190 of Figure 1 selects an image to be projected based on manipulation by a user, the image data to be projected can be transmitted to the beam projector 160 via the IRM control system 180 and the scaler on the controller. 165 can scale the image data to be projected according to a beam projection format. As another example, the climber can be installed on the 180 IRM control system instead of the 165 beam projection controller.
[0094] Due to the fact that the beam projector 160, together with the movable table 121, is inserted into the hole of the housing 110, the beam projector 160 can include an electromagnetic field shield so as to avoid being affected by or affect a magnetic field and an electric field within the hole of housing 110.
[0095] The beam projector 160 may also form a circuit that is configured to minimize the influence of a high magnetic field within the hole in the housing 110.
[0096] Figure 6 is a block diagram of a schematic structure of a constant voltage control circuit of light source driver 166, which is a part of beam projector circuit block 160. Referring to Figure 6 , the light source driver 166 is required to supply constant voltage power to the light source 167, even when a rapidly changing current is generated, in order to make the light source 167 glow constant during operation of the device. beam projector 160. Light source driver 166 may use an adjustable dimmer 1661 that does not use inductors in order to minimize the influence of a high magnetic field. The 1661 adjustable regulator transforms input power into a preset constant voltage and outputs the preset constant voltage. Due to the fact that the 1661 adjustable regulator does not use inductors, the 1661 adjustable regulator is not greatly affected by a strong magnetic field inside the hole in the housing 110. However, when only the 1661 adjustable regulator is used, a switching time may occur. be delayed due to its characteristics. Thus, when a current changes rapidly, there may be difficulty in maintaining a stable emission of a constant voltage energy level. Accordingly, the light source driver 166 may additionally include a constant voltage controller 1662 and a current sensor 1663. The constant voltage controller 1662 may include a fast switching device such as a field effect transistor. (FET) or a transistor (TR). Current sensor 1663 senses a current supplied to light source 167 and feeds information referring to a magnitude of the current back to constant voltage controller 1662. Constant voltage controller 1662 stably supplies constant voltage power to the light source 167 under the fast control of the fast switching device, based on information referring to the current magnitude detected by the current sensor 1663, so that the light source 167 emits a beam of light with a constant brightness for use in beam projection.
[0097] Figures 7, 8 and 9 illustrate an operation of the device for MRI 100.
[0098] Figures 7 and 8 illustrate a movement 126 of housing 110 when an inspection target is arranged on the moving table 121. Referring to Figures 7 and 8, an MRI scan is conducted when the inspection target is arranged on the table movable 121. Accordingly, before the MRI scan begins, the beam projector 160 is mounted on one of the first and second detachable submodules 150-1 and 150-2 that are adjacent to the inspection target's head. Figures 7 and 8 illustrate a case in which the first detachable submodule 150-1 is adjacent to the inspection target head.
[0099] When an MRI scan begins, the movable table 121 enters the hole of the housing 110. When the movable table 121 enters the hole of the housing 110, the beam projector 160 is driven to project an image onto the inner wall 110a of the housing 110a. housing 110. Beam projector 160 may start image projection at the moment the inspection target head enters the hole in the housing 110, just before the inspection target head enters the hole in the housing 110, or immediately after the inspection target head enters the hole in the housing 110. inspection target head enters the hole of the housing 110. Alternatively, the point in time at which the beam projector 160 starts projecting the image may be defined to be a point in time when the movable table 121 enters the hole. housing 110, regardless of the location of the inspection target's head.
[00100] The beam projector 160 projects an image onto a portion of the inner wall 110a of the housing 110 that is visible through the eyes of the inspection target. When the inspection target is required to face up and not move during an MRI scan, the beam projector 160 may project an image to a portion of the inner wall 110a of the housing 110 that is located above the target's head. of inspection.
[00101] As the beam projector 160 is disposed adjacent the head of the inspection target, the beam projector 160 can project an image in such a way that the viewing angle of the inspection target is guaranteed. Furthermore, as the beam projector 160 is mounted on the movable table 121, the image projected by the beam projector 160 may perform a movement 127 that corresponds to the movement 126 of the movable table 121. As a result, due to the fact that an image moving along with a movement of the movable table 121 during an MRI scan, the inspection target may be able to see the image without having to move its eyes.
[00102] The image that is projected can include content such as any one or more of a moving picture, a picture, scan state information (e.g. scan time information, scan guide information and scan area information), and information for use in MRI. For example, when an MRI scan starts, brief scan guide information may be displayed. A scan completion time can also be displayed in real time. To decrease the strain on the inspection target, an image that is not relevant to the MRI scan, such as news, can also be displayed.
[00103] The direction in which the inspection target head is oriented can be changed with respect to the longitudinal direction of the movable table 121, based on scanning purposes.
[00104] Referring to Figure 9, the inspection target head direction is opposite to that illustrated in Figures 7 and 8. When the inspection target position is changed as in Figure 9, beam projector 160 is detached from the first detachable sub-module 150-1 and is newly attached to the second detachable sub-module 150-2 adjacent to the head of the arranged inspection target whose position has been changed. In particular, in Figures 7 and 8, due to the fact that the inspection target head is adjacent to the first detachable sub-module 150-1, the beam projector 160 operates while attached to the first detachable sub-module 150-1. However, in Figure 9, due to the fact that the inspection target head is changed to be adjacent to the second detachable sub-module 150-2, the beam projector 160 is detached from the first detachable sub-module 150-1 and attached to the second detachable submodule 150-2. As described above, due to the fact that each of the first and second detachable submodules 150-1 and 150-2 includes the detachable sensor 153 of Figure 4, such detachment or attachment can be detected. When information regarding a detachment or attachment from the beam projector 160 is transmitted to the IRM control system 180, the IRM control system 180 stops supplying the video signal/control signal and power to the IRM 180 control system. first detachable submodule 150-1 from which the beam projector 160 is detached and starts supplying the video signal/control signal and power to the second detachable submodule 150-2 to which the beam projector 160 is attached.
[00105] The point in time at which the beam projector 160 starts projecting the image may vary based on whether a first arrangement (i.e. the case of Figures 7 and 8) at which the inspection target head is located oriented towards the hole of the housing 110 or a second arrangement (i.e. the case of Figure 9) in which the legs of the inspection target are oriented towards the hole of the housing 110 is used. In particular, when the first arrangement is used, the image projection onto the inner wall 110a of the housing 110 may start at the moment when the inspection target head enters the hole of the housing 110. When the second arrangement is used, the projection of image on the inner wall 110a of housing 110 may start the moment the inspection target's neck enters the hole of housing 110. Of course, the point in time at which beam projector 160 starts projecting image may vary based on the user selections.
[00106] When a user selects suitable content through console 190, information referring to the selected content is transmitted to beam projector 160 through IRM control system 180 and detachable module 150 and CPU 162 of beam projector 160 control each unit of beam projector 160 to project an image in response to an image delivery request. When the selected content does not conform to a resolution and image size that are suitable for image output, the MRI control system 180 may transmit to the beam projector 160 a control command that requests an image output. to be changed and the beam caster controller 165 of the beam projector 160 can scale the selected content up or down, according to the proper resolution and the proper image size, in response to the request for an output change of Image..
[00107] Conventional MRI devices can cause, for example, boredom of an inspection target due to a long scan, an inconvenience of the inspection target due to the narrowing of a space in which the inspection target is arranged, and degradation the quality of an MRI image due to movement of the inspection target during a scan due to such boredom or inconvenience. In contrast, the MRI apparatus 100 according to the present exemplary embodiment is capable of delivering various types of content to an inspection target by displaying an image within an open space of the hole in accordance with a beam projection method as described above, thereby reducing the boredom or inconvenience of the inspection target due to a long scan. This leads to a reduction in inspection target movement, thereby preventing degradation in the quality of an MRI image.
[00108] Figure 10 is a schematic diagram of an MRI apparatus 100', in accordance with another exemplary embodiment, Figure 11 is a schematic perspective view of a detachable module 150' which is employed in the MRI apparatus 100' of Figure 10 and Figure 12 is a block diagram of the detachable module 150' of Figure 11. The MRI apparatus 100' according to the present exemplary embodiment is substantially the same as the MRI apparatus 100 according to the previous exemplary embodiment. except for the detachable module 150', then a duplicate description of it will be omitted.
[00109] Referring to Figures 10, 11, and 12, the detachable module 150', in accordance with the present exemplary embodiment, may include a first detachable sub-module 150'-1 and a second detachable sub-module 150'-2 , which are respectively arranged at both ends of the movable table 121, with respect to the longitudinal direction, as in the previous exemplary embodiment. The first detachable sub-module 150'-1 and the second detachable sub-module 150'-2 can have the same components. In what is described below, the detachable module 150' may be referred to as the first detachable sub-module 150'-1 or the second detachable sub-module 150'-2.
[00110] The detachable module 150' includes a base member 1501, which is attached to the movable table 121, and a swivel unit 1502, which is mounted on the base member 1501. The swivel unit 1502 may include, for example, a first rotating subassembly 1503, which rotates in a first direction 1503A, and a second rotating subassembly 1504, which rotates in a second direction 1504A. The first direction 1503A and the second direction 1504A can be different from each other, and thus a support 1505 can be directed in either direction by a combination of the first direction 1503A and the second direction 1504A. For example, the first direction 1503A of the first rotating subassembly 1503 may be a direction in which the first rotating subassembly 1503 rotates around a rotating geometry axis, which is in a direction normal to the base member 1501, and the second direction 1504A of the second rotary subassembly 1504 may be a direction in which the second rotary subassembly 1504 rotates about a rotary axis that is perpendicular to the first direction rotary axis 1503A.
[00111] Detachable module 150' may additionally include a drive motor 1508 which rotates the rotary unit 1502. The drive motor 1508 is controlled by the IRM control system 180. A drive shaft 1507 releases a drive force between the swivel unit 1502 and drive motor 1508, and may be rigid or flexible. When the rotating unit 1502 includes the first and second rotating subunits 1503 and 1504, the drive force released by the drive shaft 1507 can be selectively distributed to one of the first and second rotating subunits 1503 and 1504. The drive motor 1508 it can be arranged outside the housing 110, as well as not entering the hole of the housing 110, and can still transmit the driving force to the rotating unit 1502, via the drive shaft 1507. If the drive motor 1508 is located outside the housing 110, even when an electromagnetic motor is used as the drive motor 1508, an influence of a magnetic field, inside the hole of the housing 110, under the drive motor 1508, can be effectively reduced, and then the burden of having to include an electromagnetic shield can be reduced.
[00112] Bracket 1505 is mounted to swivel unit 1502, and beam projector 160 is mounted to bracket 1505 as detachable therefrom. The bracket 1505 includes a connector 1506, which makes mechanical and electrical contact with a connector 1601 of the beam projector 160. The connector 1506 of the bracket 1505 includes electrode terminals that are configured to transmit the video signal and the control signal received. from IRM control system 180 to beam projector 160. Video signal, control signal and power can be transmitted from detachable module 150' to beam projector 160 by mutual connection between connector 1506 of the detachable module 150' and the connector 1601 of the beam projector 160.
[00113] Rotation of swivel unit 1502 changes the direction of bracket 1505 in which beam projector 160 is held. Then, the direction the beam projector 160 projects an image can be changed to match the direction the inspection target is facing.
[00114] Referring to Figure 12, the detachable module 150' may additionally include a motor drive unit 154 which is configured to drive the drive motor 1506, as opposed to the detachable module 150 of Figure 4. The drive unit motor 154 receives motor power and a control signal to drive the drive motor 1506 from the IRM control system 180 and then drives the drive motor 1506, thus changing the direction in which the beam projector 160 projects an image.
[00115] Figure 13 illustrates an operation of the MRI device 100' of Figure 10.
[00116] The direction in which the inspection target is seated on the movable table 121 can be changed based on scanning purposes. For example, as illustrated in Figure 13, the inspection target can be re-seated on its side for a specific IRM scanning purpose. In this case, because the inspection target is facing a lateral direction, the detachable module 150' (that is, the first detachable sub-module 150'-1 or the second detachable sub-module 150'-2), to which the beam 160 has been fixed, you can rotate the swivel unit 1502, as indicated by the reference character C, so that the beam projector 160 can project an image in the lateral direction, which is the same as the direction in which the beam target. inspection is turned.
[00117] Such a change, in the direction in which the beam projector 160 projects an image, may be performed automatically or may be performed by manipulation by a user. When the inspection target is returned to its side, a user can manipulate the console 190, in correspondence with the movement of the inspection target, so that the beam projector 160 can project an image in the lateral direction.
[00118] Referring again to Figure 10, the MRI apparatus 100' may additionally include a local tracking sensor 140 in order to capture the location where the inspection target is seated or the direction towards which the inspection target is back. The local tracking sensor 140 may include a camera that is configured to photograph the face of an inspection target or any other common sensor. For example, when the local tracking sensor 140 includes a camera, a picture taken of the face of the inspection target is sent to the IRM control system 180, and the signal processor 185 for projection of the IRM control system 180 detects the position of the eyeball of the inspection target, from the figuration of the inspection target's face. A method of detecting the position of the eyeball of the inspection target from the picture of the inspection target's face is a commonly known technology, so a detailed description of it will be omitted. The MRI control system 180 can automatically control the rotating unit 1502 of the detachable module 150' to be rotated in correspondence with the detected eyeball position of the inspection target, as indicated by the reference character C in Figure 13, so that beam projector 160 can project an image in the same direction as the direction the inspection target is facing.
[00119] In the exemplary embodiment of Figures 10, 11, 12, and 13, the swivel unit 1502, which is included in the detachable module 150', is an example of a projection direction converter that converts the direction in which the projection beam 160 projects an image. As another example, beam projector 160 may include such a projection direction converter. For example, the projection lens 170 can be mounted to the beam projector housing 160 such that the direction of the projection lens 170 is changeable.
[00120] Although a drive module that includes drive shaft 1507 and drive motor 1508 is illustrated in the exemplary embodiment of Figures 10, 11, 12, and 13, other well-known drive mechanisms may be employed. For example, a hydraulic system can be used as the drive module for the swivel unit 1502 of the detachable module 150'. The swivel unit 1502 can be rotated manually.
[00121] Although it is illustrated, in the exemplary embodiment of Figures 10, 11, 12, and 13, that the direction of support 1505 is changed due to a combination of pan and tilt of the first and second swivel subassemblies 1503 and 1504 of the detachable module 150', a single axis rotation mechanism, or a multiple axis rotation mechanism, may be employed as the rotatable unit of the detachable module 150'. Alternatively, beam projector 160 may be coupled or docked to a plurality of locations on detachable module 150' that include a top surface and left and right side surfaces of detachable module 150', and then the direction in which the beam projector 150' beam 160 projects an image may be altered by appropriately selecting locations on detachable module 150' to which beam projector 160 is to be coupled from among the plurality of locations.
[00122] Figure 14 is a diagram illustrating a curved surface distortion of an image projected on the MRI apparatus 100' of Figure 10, and Figure 15 is a diagram illustrating the skewed distortion of an image projected on the MRI apparatus 100' of Figure 10.
[00123] The inner wall 110a of the housing 110 has a cylindrical cross-section. Then, an image projected onto the inner wall 110a of the housing 110 exhibits curved surface distortion, due to the curve of the inner wall 110a. Accordingly, the beam projection control unit 165 of Figure 5 can remove a curved surface distortion from an image formed on the inner wall 110a by generating a preceding primary distortion in advance to deflect the curved surface distortion during video signal processing.
[00124] By converting the video signal received from the IRM control system 180 into a video signal for beam projection, the beam projection controller 165 of Figure 5 can serve as a correction processor that performs a preemptive correction for deflect a distortion that is generated when an image is projected onto the inner wall 110a of the housing 110.
[00125] Referring to Figure 15, when viewed from the cross-section of the housing 110, a beam of light B can be projected, on one side, obliquely, with respect to the inner wall 110a of the housing 110. If a target of inspection is facing an upper side of the inner wall 110a of the housing 110 and the beam projector 160 is separated from the inspection target's head by a predetermined distance, the beam projector 160 can be called upon to project the light beam B obliquely, with respect to the inner wall 110a of the housing 110. Such an oblique projection can cause bias distortion to occur. Accordingly, the beam projection controller 165 can serve as a correction processor that also removes distortion from an image formed on the curved inner wall 110a by additionally generating, during video signal processing, a preceding secondary distortion to shift the skewed distortion.
[00126] When the direction in which the beam projector 160 projects an image makes a movement C along the inner wall 110a of the housing 110, as the direction the inspection target is facing is changed, an image projected onto the wall Inner wall 110a of housing 110 has curved surface distortion due to the curved shape of inner wall 110a. When the direction in which the beam projector 160 projects an image is moved relative to the vertical direction of the housing 160, the amount of skew distortion may change. As such, when the direction in which the beam projector 160 projects an image is changed, the beam projection controller 165 may change the amounts of prior primary distortion and prior secondary distortion based on the change.
[00127] Although a curved surface distortion due to the curved shape of the inner wall 110a or a skew distortion due to the oblique projection on the inner wall 110a is corrected by executing a signal processing method in the beam projection controller 165 of Figure 5 , in the present exemplary embodiment, the present concept of the invention is not limited thereto. A correction processor that removes a curved surface distortion or a skew distortion, or both, can be included in the IRM 180 control system. An optical method, as opposed to a signal processing method, can be used to remove a or both of these distortions.
[00128] While each of the detachable modules 150 and 150' includes both the first detachable sub-module 150-1 and the second detachable sub-module 150-2 in the exemplary embodiments described above, the present concept of the invention is not limited thereto. For example, each of the detachable modules 150 and 150' may include only one of the first and second detachable submodules 150-1 and 150-2. Alternatively, each of the detachable modules 150 and 150' may be mounted in three or more locations on the movable table 121. The beam projector 160 may be attached to the movable table 121 without interposing the detachable module 150 or 150' between them. .
[00129] Although the hole of the housing 110 has a cylindrical structure in the exemplary embodiments described above, the present concept of the invention is not limited thereto. For example, the hole in housing 110 can be oval or any one of other shapes.
[00130] Figure 16 is a schematic diagram of an MRI apparatus 100" according to another exemplary embodiment. Referring to Figure 16, the hole in a housing 110 of the MRI apparatus 100" may include a curved inner wall 111a and a flat inner wall 111b. The flat inner wall 111b may be formed in an upper part of the hole in the housing 111. The flat inner wall 111b may extend in the longitudinal direction of the hole in the housing 111.
[00131] The beam projector 160 can project an image onto the flat inner wall 111b. Since the flat inner wall 111b is positioned on top of the hole where the inspection target is facing, when it rests on the movable table 121 around it, an image projected onto the flat inner wall 111b by the beam projector 160 can be seen directly by the inspection target while it is seated, on its back, on the movable table 121. When an image is projected onto the flat inner wall 111b, no curved surface distortion is generated in the projected image, contrary to the exemplary embodiments previously described. So, curved surface distortion correction cannot be performed.
[00132] Although the flat inner wall 111b is formed on top of the hole of the housing 111, in the present exemplary embodiment, the present concept of the invention is not limited thereto. For example, the flat inner wall 111b can be positioned on a side of the hole in the housing 111.
[00133] Although the single flat inner wall 111b is included in the hole of the housing 111, in the present exemplary embodiment, the present concept of the invention is not limited thereto. In particular, the hole of housing 111 may include a plurality of flat inner walls and a plurality of curved inner walls, or it may include only a plurality of flat inner walls. For example, the hole in housing 111 may include only flat inner walls and then have a polygonal cross-section.
[00134] Figure 17 is a schematic diagram of an MRI apparatus 200, according to another exemplary embodiment.
[00135] Referring to Figure 17, in the MRI apparatus 200, only a reflection mirror 270 is installed on the movable table 121, which is movable in the hole of the housing 110, and a beam projector 260 is located outside the hole of the housing 110. At least a portion of the holder 122 extends out of the hole in the housing 110. The beam projector 260 can be mounted on the portion of the holder 122 that extends out of the hole in the housing 110. During an MRI scan, Due to the fact that the movable table 121 is supported by the support 122 and enters the hole of the housing 110, and the support 122 is fixed, the reflection mirror 270 on the movable table 121 enters the hole of the housing 110, while the beam projector 260 remains outside the hole in housing 110.
[00136] The present exemplary embodiment is substantially the same as the previous exemplary embodiment, except for the changes that are generated by positioning the beam projector 260 outside the hole in the housing 110, in accordance with the arrangement of the reflection mirror 270 , on the movable table 121.
[00137] The 260 beam projector can project a collimated beam of light that has an infinite focus. Alternatively, beam projector 260 may project a converging beam of light or a diverging beam of light. The reflecting mirror 270 may include an aspherical reflective surface, which reflects a beam of light projected by the beam projector 260 and which simultaneously magnifies the beam of light to a wide angle. Alternatively, reflection mirror 270 may include a flat panel-like reflective surface that reflects the beam of light projected by beam projector 260, unchanged.
[00138] Similarly, as described above with respect to the previous exemplary embodiment, due to the fact that the location of the head of a seated inspection target can be changed, the first and second detachable reflection mirror devices 271 and 272, to , and from which the reflection mirror 270 is attachable and detachable, can respectively be installed at both ends of the movable table 121, where the head of the inspection target is to be placed. Each of the first and second detachable reflection mirror devices 271 and 272 may include a rotatable structure, which is manually or automatically rotatable in either direction, in a similar manner to the rotatable mode of the rotatable unit 1502, of the detachable module 150' of Figure 11. Accordingly, each of the first and second detachable reflecting mirror devices 271 and 272 can manually or automatically control the angle of inclination such that the direction in which the reflecting mirror 270 reflects an image is consistent with the direction the inspection target is facing.
[00139] The first and second detachable submodules 250-1 and 2502, for and from which the beam projector 260 is attachable and detachable, may be installed, respectively, at both ends of the support 122. beam 260, which projects an image outside the hole of housing 110, the first and second detachable submodules 250-1 and 250-2, to and from which the beam projector 260 is attachable and detachable, the reflecting mirror 270, which reflects a beam of light projected by beam projector 260 to the inner wall 110a of housing 110, the first and second detachable reflecting mirror devices 271 and 272, and an IRM control system 280, which controls the beam projector 260, and the detachable module projector 250 constitutes an in-hole display device.
[00140] Similarly, as described above, with respect to the previous exemplary embodiment, the first detachable sub-module 250-1 and the second detachable sub-module 250-2 cannot just have the beam projector 260 attached thereto, and the beam projector 260 detached from them, but also can perform the function of a connector, through whose energy, a video signal and a control signal, which is supplied from the IRM control system 280, are transmitted to the beam projector 260 Furthermore, the first detachable sub-module 250-1 and the second detachable sub-module 2502 may each include the detachable sensor 153 of Figure 4 in order to capture a fixture or detachment of the beam projector 260, and then , can transmit information regarding the attachment or detachment of the beam projector 260 to/from the IRM control system 280.
[00141] Due to the fact that the beam projector 260 is arranged outside the hole of the housing 110, unlike the previous exemplary embodiment, the beam projector 260 is relatively free from the influence of a magnetic field and an electric field inside. hole in housing 110, and therefore need not have strict electromagnetic field protection. So the 260 beam projector can be projected more freely. In the exemplary embodiment described above, when the beam projector 160 is situated within the hole of the housing 110, a light source driver circuit 166, in preparation for a high magnetic field, is separately designed as described above with reference to the Figure 6. However, in the present exemplary embodiment, the projection load of such a circuit is reduced.
[00142] Figure 18 illustrates a display operation inside the hole of the MRI apparatus 200 of Figure 17. Referring to Figure 18, the beam projector 260 projects a beam of light B that includes an image, and the mirror of reflection 270 reflects the light beam B onto the inner wall 110a of the housing 110.
[00143] When the inspection target is seated on the movable table 121 for an MRI scan, before the MRI scan begins, the beam projector 260 is mounted on one of the first and second detachable submodules 250-1 and 250-2, which is adjacent to the inspection target's head. Similarly, reflection mirror 270 is mounted on one of the first and second detachable reflection mirror devices 271 and 272 that are adjacent to the head of the inspection target. Figure 17 illustrates a case where the first detachable submodule 250-1 and the first detachable reflection mirror device 271 are adjacent to the inspection target head.
[00144] When an MRI scan begins, the movable table 121 enters the hole of the housing 110. Due to the reflection mirror 270 being arranged on the movable table 121, the reflection mirror 270 enters the hole of the housing 110, as the movable table 121 is moved. Because the beam projector 260 is mounted on the support 122, even as the movable table 121 enters the hole in the housing 110, the beam projector 260 is still positioned outside the hole in the housing 110.
[00145] Beam projector 260 starts image projection the moment the inspection target head enters the hole in the housing 110, just before the inspection target head enters the hole in the housing 110, or immediately after the inspection target head enters the hole in the housing 110. inspection target head enters the hole of the housing 110. Alternatively, the time point when the beam projector 260 starts projecting the image may be set to be a point of time when the movable table 121 enters the hole of the housing 110, regardless of the location of the inspection target's head.
[00146] Because the reflecting mirror 270 is arranged on the movable table 121, an image that is reflected by the reflective mirror 270 and formed on the inner wall 110a of the housing 110 is moved as the movable table 121 is moved . The beam projector 260 can project a collimated beam of light B that has an infinite focus. In that case, even when a distance between the reflecting mirror 270 and the beam projector 260 is changed due to a movement 126 of the movable table 121, the focus of an image formed on the inner wall 110a of the housing 110 by the reflecting mirror 270 , can be kept unchanged, regardless of the movement 126 of the movable table 121.
[00147] Figure 19 is a schematic view of an MRI apparatus 300, according to another exemplary embodiment.
[00148] Referring to Figure 19, in the MRI apparatus 300, a projection lens unit 370 is installed on the movable table 121, which is movable in the hole of the housing 110, and a video unit 360 is located outside the hole. housing 110. The video unit 360 and the projection lens unit 370 are connected to each other by means of a fiber optic cable 375. The fiber optic cable 375 is flexible, and so, even when a distance between the video unit 360 and the projection lens unit 370 is changed, due to a movement of the movable table 121, the video unit 360 and the projection lens unit 370 can be optically connected to each other. Video unit 360, fiber optic cable 375 and projection lens unit 370 constitute a well-known fiber optic projector.
[00149] As illustrated in Figure 19, a video unit 360 can be installed on the support 122, which movably supports the movable table 121. Similarly, as described above with respect to the previous exemplary embodiments, due to the fact that the direction in which an inspection target is seated can be changed, the first and second detachable projection lens unit devices 371 and 372 to and from which the projection lens unit 370 is attachable and detachable, can be respectively installed at both ends of the movable table 121, such that they are adjacent to the respective places where the inspection target's head can be placed. The first and second detachable submodules 350-1 and 350-2 of the video unit, to and from which the video unit 360 is attachable and detachable, can respectively be installed at both ends of the support 122. The unit 360, which produces an image outside the hole of the housing 110, the first and second detachable submodules 350-1 and 350-2 of the video unit, to and from which the video unit 360 is attachable and detachable , projection lens unit 370, which projects light beams produced by video unit 360 to inner wall 110a of housing 110, and an IRM control system 380 constitute an in-hole display device.
[00150] Similarly, as described above with respect to the above exemplary embodiments, the first detachable sub-module 350-1 of the video unit and the second detachable sub-module 350-2 of the video unit cannot only have the video unit 360 attached to the same and detached from them, but can also perform a function of a connector, by means of which power, a video signal and a control signal that is supplied from the IRM control system 380 are transmitted to the video unit 360. Furthermore, each of the first detachable sub-module 350-1 of the video unit and the second detachable sub-module 350-2 of the video unit may include the detachable sensor 153 of Figure 4 in order to capture an attachment or a detachment of the video unit. video unit 360, and can then transmit information regarding the attachment or detachment of the video unit 360 to/from the IRM control system 380. Although the detachable module of the video unit 350 includes both the first detachable sub-module 350-1 of the video unit and the second detachable sub-module 350-2 of the video unit in the present exemplary embodiment, the present concept of the invention is not limited thereto.
[00151] Each of the first and second detachable projection lens unit devices 371 and 372 may include a swivel frame, which is manually or automatically swivelable in either direction, in a manner similar to the swivel mode of the swivel unit 1502 of the detachable module 150' of Figure 11 . Accordingly, each of the first and second detachable projection lens unit devices 371 and 372 can manually or automatically control the tilt angle such that the direction in which the projection unit 370 projection lens projects an image that is consistent with the direction the inspection target is facing.
[00152] Figure 20 is a schematic view of a fiber optic projector of the MRI scanner 300 of Figure 19.
[00153] Referring to Figure 20, when the inspection target is seated on the movable table 121 for an MRI scan, before the MRI scan starts, the video unit 360 is mounted on one of the first and the second detachable submodule 350-1 and 350-2 of the video unit which is adjacent to the head of the inspection target. Similarly, the projection lens unit 370 is mounted to one of the first and second detachable projection lens devices 371 and 372 that are adjacent to the head of the inspection target. Figure 20 illustrates a case where the first detachable submodule 350-1 of the video unit and the first detachable projection lens unit device 371 are adjacent to the head of the inspection target.
[00154] When an MRI scan starts, the slide table 121 enters the hole of the housing 110. Because the projection lens unit 370 is arranged on the slide table 121, the projection lens unit 270 enters the hole housing 110 as the movable table 121 is moved. Because the video unit 360 is mounted on the support 122, even when the movable table 121 enters the hole in the housing 110, the video unit 360 is still positioned outside the hole in the housing 110.
[00155] The video unit 360 starts projecting the image the moment the inspection target head enters the hole in the housing 110, just before the inspection target head enters the hole in the housing 110, or immediately after the inspection target head enters the hole in the housing 110. inspection target head enters the hole of the housing 110. Alternatively, the time point when the video unit 360 starts projecting the image may be set to be a point of time when the movable table 121 enters the hole of the housing 110, regardless of the location of the inspection target's head.
[00156] Video unit 360 produces an image and transmits a beam of light, which includes the image, to projection lens unit 370 via fiber optic cable 375. Fiber optic cable 375 includes a plurality of optical fibers 365a, and optical fibers 365a may be installed at an output end of the video unit 360 and at an input end of the projection lens unit 370 in the same arrangement. Accordingly, the optical fibers 365a of the fiber optic cable 375 transmit a beam of light B from the image that is produced by the video unit 360 to the projection lens unit 370, while maintaining the image. The light beam B of the image that is transmitted to the projection lens unit 370 is projected to the inner wall 110a of the housing 110 by means of the projection lens 371. Because the projection lens unit 370 is arranged at the movable table 121, an image that is projected by the projection lens unit 370 and formed on the inner wall 110a of the housing 110 is moved as the movable table 121 is moved.
[00157] According to the present exemplary embodiment, since a fiber optic projector method is used and the video unit 360 can be arranged outside the hole of the housing 110, the video unit 360 is relatively free from the influence of a magnetic field and an electric field within the hole of the housing 110. Because the projection lens unit 370 is formed of optical components that are not affected by an electromagnetic field, the display device in the hole, in accordance with the This exemplary embodiment need not have strict electromagnetic field protection, and therefore can be designed more freely.
[00158] The MRI devices 100, 100', 100", 200 and 300, according to the exemplary modalities described above, can allow an inspection target that is scanned to see various contents (for example, a picture in motion, a picture, scan state information (e.g., scan time information, scan guide information, and scanned area information), and information for use in MRI), and can display high-quality images by displaying a image into the hole by implanting a projection method.
[00159] While the present concept of the invention has been particularly shown and described, with reference to exemplifying embodiments thereof, it will be understood by persons skilled in the art that various changes in form and detail may be made therein without depart from the spirit and scope of the present concept of the invention, as defined by the following claims.

权利要求:
Claims (13)
[0001]
1. Magnetic resonance imaging (MRI) apparatus, characterized in that it comprises: a housing that includes an orifice where a magnetic field is applied for use in an MRI scan; a movable table that is configured to provide placement of a patient and to enter the housing hole; a projector disposed on the movable table, wherein the projector is configured to project an image onto an inner wall of the housing, wherein the inner wall at least partially forms the hole in the housing; and a controller that is configured to control the projector and to transmit a video signal to the projector, wherein the projector is operable to project the image when the projector on the movable table is positioned with the movable table inside the hole in the housing, wherein the projector comprises a light source driver that is configured to supply a stabilized constant voltage power that has a constant level to a light source of the projector, the light source driver comprising: an adjustable dimmer that is configured to transform an input power into a preset constant voltage and to output the preset constant voltage, and is free of inductors; a constant voltage controller circuit which is configured to receive the constant voltage output preset by the adjustable regulator as an input and to output the stabilized constant voltage power to the light source; and a current sensor that is configured to sense a current that is supplied to the light source and to transmit information referring to a magnitude of the current drawn to the constant voltage controller circuit, wherein the constant voltage controller circuit is configured to output stabilized constant voltage power to the light source based on the information.
[0002]
2. MRI device according to claim 1, characterized in that an inner wall of the housing is curved in a substantially cylindrical formation.
[0003]
3. MRI device, according to claim 1, characterized in that at least a part of the inner wall of the housing is flat and the projector is additionally configured to project an image at least on the flat part of the inner wall.
[0004]
4. MRI device, according to claim 1, characterized in that it additionally comprises a correction processor that is configured to process a signal referring to the image that is to be projected by the projector, in such a way that a distortion of the image due to a curvature and/or an inclination of the inner wall of the housing is substantially displaced as a result of the signal processing.
[0005]
5. MRI apparatus according to claim 1, characterized in that the projector comprises a projection direction converter that is configured to convert a direction in which the projector projects the image.
[0006]
6. MRI device according to claim 1, characterized in that a location on an internal wall of the housing on which the image is projected changes based on a location of the movable table within the hole in the housing when the table mobile enters the hole in the housing.
[0007]
7. MRI apparatus, according to claim 1, characterized in that the projector comprises an illumination sensor that is configured to control a beam brightness of the image that is projected by the projector based on a state of an illuminance within of the orifice.
[0008]
8. MRI apparatus according to any one of claims 1 to 7, characterized in that the projector is arranged on at least one end of the movable table in relation to a longitudinal direction of the movable table.
[0009]
9. MRI device according to claim 8, characterized in that the projector additionally comprises a detachable module which is mounted on the movable table and to which the projector is detachably coupled.
[0010]
10. MRI device according to claim 9, characterized in that the detachable module comprises a first detachable sub-module and a second detachable sub-module, wherein the first detachable sub-module is arranged at a first end of the movable table in relation to the longitudinal direction and the second detachable sub-module is disposed at a second end of the movable table which is opposite to the first end of the movable table with respect to the longitudinal direction.
[0011]
11. MRI device according to claim 10, characterized in that each of the first detachable sub-module and the second detachable sub-module comprises a respective connection terminal that is configured to transmit power and a video signal that is received from the controller to the projector and a respective detachable sensor that is configured to pick up a fixture or a fixture from the projector, and the controller is additionally configured to supply power and video signal to only one submodule to which the projector is attached between the first detachable sub-module and the second detachable sub-module, based on the respective information referring to the respective attachment or the respective detachment of the projector captured by each respective detachable sensor.
[0012]
12. MRI device, according to claim 9, characterized in that the detachable module comprises a projection direction converter that is configured to convert a direction in which the projector projects the image.
[0013]
13. A method for displaying an image into an orifice of a magnetic resonance imaging (MRI) apparatus, wherein the method is characterized in that it comprises: causing a movable table on which a patient is seated to come into a hole in an MRI machine housing where a magnetic field for use in an MRI scan is applied; and projecting, by means of a projector disposed on the movable table, an image onto an internal wall of the housing, wherein the internal wall at least partially forms the hole in the housing, wherein the projector is operable to project the image when the projector is positioned inside the hole of the housing wherein the projector is operable to project the image when the projector on the movable table is positioned with the movable table inside the hole of the housing, wherein providing the projector with a light source trigger that is configured to supply a stabilized constant voltage power having a constant level to a projector light source, the light source driver comprising: an adjustable regulator which is configured to transform an input power into a preset constant voltage and to output the pre-set constant voltage, and which is free of inductors; a constant voltage controller circuit which is configured to receive the constant voltage output preset by the adjustable regulator as an input and to output the stabilized constant voltage power to the light source; and a current sensor that is configured to sense a current that is supplied to the light source and to transmit information referring to a magnitude of the current drawn to the constant voltage controller circuit, wherein the constant voltage controller circuit is configured to output stabilized constant voltage power to the light source based on said information.

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WO2014069892A1|2014-05-08|

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法律状态:
2018-11-21| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|

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2020-07-14| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|

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2021-12-07| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|

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2022-01-25| B16A| Patent or certificate of addition of invention granted [chapter 16.1 patent gazette]|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 30/10/2013, OBSERVADAS AS CONDICOES LEGAIS. |

优先权:

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申请号 | 申请日 | 专利标题

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KR10-2012-0124471|2012-11-05|

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KR20120124471|2012-11-05|

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KR10-2013-0057952|2013-05-22|

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KR1020130057952A|KR101525013B1|2012-11-05|2013-05-22|Magnetic resonance imaging apparatus|

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PCT/KR2013/009725|WO2014069892A1|2012-11-05|2013-10-30|Magnetic resonance imaging apparatus|

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