• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
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    • 专利摘要:
    Foconable compton camera equipped with variable separation detectors. The present invention relates to a focusable compton chamber comprising: a compton scattering detector (1); one or more absorption detectors (2, 2 '), whose planes are separated from the plane of the dispersion detector (1); and a mechanical system (3) for separating the scattering (1) and absorption sensors (2, 2 ') to vary said distance (d) comprised between said detectors (1, 2, 2'). The invention allows to improve the information associated with the formation of images by means of gamma radiation, by calculating the distance of the objects evaluated, as well as to identify the distribution of the radioisotopes present in said objects, thus overcoming the limitations of other equipment and state-of-the-art cameras. (Machine-translation by Google Translate, not legally binding)
    公开号:ES2626044A1
    申请号:ES201531855
    申请日:2015-12-21
    公开日:2017-07-21
    发明作者:Cesar DOMINGO PARDO；Luis Caballero Ontanaya；Francisco Javier Albiol Colomer；Jorge AGRAMUNT ROS
    申请人:Empresa Nacional De Residuos Radioactivos Enresa；Empresa Nac De Residuos Radioactivos Enresa；Consejo Superior de Investigaciones Cientificas CSIC；Universitat de Valencia；
    IPC主号:
    专利说明:

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    DESCRIPTION
    FOCALIZABLE COMPTON CAMERA EQUIPPED WITH VARIABLE SEPARATION DETECTORS
    FIELD OF THE INVENTION
    The present invention is framed in the field of image formation techniques by means of gamma radiation. More specifically, the invention relates to a Compton-type gamma camera, which is useful in the field of nuclear medicine, as well as for monitoring nuclear threats, dismantling of radioactively contaminated areas and port security.
    BACKGROUND OF THE INVENTION
    In the known procedures for the control by gamma radiation or dismantling of areas potentially contaminated by radioactive material, such as nuclear power plants, it is necessary to obtain information on which radioisotopes are present in these areas, in which abundance they are found and what is their spatial distribution . This information determines and determines, later, the actions to be carried out in the control, classification and dismantling tasks. In this context, the characterization of radioactive zones through the detection of gamma radiation entails, therefore, three main processes:
    i) The identification of the radioactive nuclei present in the area.
    ii) The study of the spatial distribution of said radioactive nuclei.
    iii) The quantification of the activity associated with the radiation sources present in the affected area.
    Normally, these processes are performed separately, first identifying the radioactive nuclei and then studying their spatial distribution. For the identification of the nuclei, gamma radiation spectrometers are used, so that spectra are obtained with the distribution of the intensities of the gamma rays detected, as a function of their energy. With this information, it is possible to identify the radioisotopes present, as each one emits characteristic gamma rays in their decay. Typically, germanium detectors (which
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    they need to be refrigerated at -172 ° C to optimize their performance) or high volume scintillation detectors.
    Regarding the spatial distribution of radioactive nuclei, there are currently two procedures used in the state of the art for their study, which depend on the type of detectors used:
    a) Mechanical collimation gamma cameras (known as Anger type cameras): they consist of a position sensitive radiation detector coupled to a pinhole or collimator type, or mask type. Examples of such devices are described in patent applications US 4797701 A, US 4348591 A and EP 0743538 A2.
    There are various types of mechanical collimators depending on the type of field of vision that is intended to be covered and the required performance (convergent or divergent collimator, parallel hole collimator, pinhole type collimator or coded mask structure).
    The collimator design in this type of cameras depends on the energy of the gamma rays that are to be detected (the greater the energy of the object gamma rays, the greater the thickness of the collimator must be) and the size of the field of vision that is intended obtain. The spatial resolution of the cameras with mechanical collimation is determined by the opening of the collimator: the smaller the opening, the greater the spatial resolution. However, and being the main limitation of this type of detectors, the detection efficiency is also determined by the opening of the collimator, decreasing significantly as its size decreases.
    Thus, these types of detectors provide specific embodiments to obtain performance in which it is required to reach a certain counting statistic with a certain preset spatial resolution, but they are not suitable for other measurement scenarios, lacking general application for different scenarios of measurement. detection.
    The procedure to study the spatial distribution of radioactive sources that involves the use of this type of cameras is the realization of a cartography of the area to be controlled, moving the detectors manually or automatically: each position involves an associated measurement (the field of vision of the detector is known) which is used to make a final composition with all the measurements in the different positions, obtaining a
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    composite map or mosaic of radiation distribution in the analyzed scenario. This method is very expensive in terms of total measurement time, as well as complex when it is planned and executed.
    b) Electronic collimation gamma cameras (known as Compton cameras): they are devices that are based on the Compton interaction of the gamma rays incident in a detection device, and their subsequent reconstruction to determine the position of the radioactive sources emitting the radiation incident. The Compton cameras preferably consist of a first detector element that promotes the Compton dispersion of the incident gamma rays, and a second detector element where the energy deposited by said rays is measured to reconstruct the trajectory of the original gamma ray and, therefore, , to obtain an image of the spatial distribution of the detected radioisotopes. Some examples of this type of cameras are described in patent applications US 7573039 B2, US 8153986 B2 and US 4124804 A.
    In certain technical applications, for example in medical imaging technologies, the analysis by these cameras can be performed for a single range of energy, since the radioisotope to be analyzed is known in advance. However, in a priori unknown radioactive environments and sources, Compton cameras have deficiencies for the rest of the energies in their performance of spatial resolution and detection sensitivity. For its part, the detection sensitivity of a Compton camera is determined by the intrinsic characteristics of the individual detectors with which it is equipped, as well as its configuration in the device. In this way, once the camera and its detectors have been built, its performance (efficiency, energetic and angular resolution) are fixed by construction, and therefore the sensitivity of the system and the set of environments or situations in which it is possible use.
    Existing Compton cameras are designed to achieve an optimized detection sensitivity for a particular range of incident radiation energies, more or less broad depending on the application, and / or in a specific range of energetic and angular resolutions, which generally also come optimized. by the final application of the camera. Therefore, and although the procedure for studying spatial distribution is simplified compared to mechanical collimation gamma cameras, they keep in common the limitation of the benefits due to the design of the system.
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    The scenarios where the measures described above are performed are defined by different variables, such as the number and distribution of radiation sources, their activity or intensity, the spectrometry of the radioisotopes to be studied, etc. Thus, the design of the camera is always optimized to maximize the performance of the system in its use in the scenario to which it is intended. Any change in the scenario in which the device is used entails a limitation in the performance of the system, directly affecting the efficiency of the measurement (longer measurement time and / or number of these) or being forced to use other devices most optimal detection for these new environment conditions. As an example, if the camera is optimized for a certain radiation energy and it is desired to detect a gamma emitting source with a different energy, it is possible that it cannot be registered or detected, at least within a certain preset measurement time.
    This problem is even more evident if the conditions of the scenario under study are unknown a priori, where being able to have a versatile equipment would reduce both the number of measurement equipment and the necessary measurement time.
    Devices and cameras for the detection of neutrons and / or gamma radiation from radioactive sources are also known in the state of the art, such as those described in patent applications US 2012/0256094 A1 and US 8237130 B1. These devices are based on arrays of several detectors, each consisting of a scintillator material coupled to a photosensor or photomultiplier tube. In this type of detection systems, the spatial resolution is determined by the size of the detectors used in the matrix, while the efficiency is proportional to the number of detectors used. In US 2012/0256094 A1, the energy resolution of the neutrons is determined by the distance between mobile detection planes separable from each other. However, this results in a reduction in the field of vision and the efficiency of gamma radiation detection.
    Thus, the use of these technologies is not transferable, in practice, to Compton cameras with high angular resolution, or to portable devices, presenting the following technical drawbacks: 1) the intrinsic spatial resolution is limited by the size of the detectors used in the matrix that configures each detection plane, with relatively large and sufficiently separate detector arrays being necessary to achieve a certain spatial sensitivity, which in turn entails relatively bulky detection devices, and 2) efficiency is limited by The number of
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    Detection elements used, resulting is severely affected by the "dead space" between the detectors that configure each matrix. In addition, in hybrid devices for simultaneous detection of neutrons and gamma radiation (US 2012/0256094 A1) the energy resolution of radiation is limited by the low atomic number (Z) necessary for neutron detection. This leads to a worsening of the angular resolution in the reconstruction of the Compton angle, and therefore of the spatial resolution attainable for gamma radiation.
    Likewise, the objective of US 2012/0256094 A1 is the obtaining of measures of angular stereo efficiency where the source comes from a more or less known focus, and the system is arranged to be efficient in that direction, presenting the drawback that, as as a consequence of the detection elements used, the detection planes cannot be fully approached (thus limiting the angular stereo efficiency); and that, since said invention is oriented to the detection of neutrons, it uses detectors of low energy resolution, thus compromising the angular resolution of gamma radiation achievable with this type of devices. Consequently, this makes it impossible to solve the problem of inspecting an enclosure completely and with a single device, using an automated procedure.
    In order to solve the aforementioned problems and limitations of the state of the art, the present invention raises a new focusable Compton camera equipment, which by its design allows to cover a wider range of detection efficiencies and / or angular and spatial resolutions, so that the accuracy, application fields and the range of scenarios where useful information can be extracted is increased. In addition, the dynamic targeting allows to selectively modify the resolution and efficiency of the system based on the characteristics of the scenario in which the measurement is performed, thereby increasing the versatility of the system.
    BRIEF DESCRIPTION OF THE INVENTION
    According to the information raised in the previous section, an object of the present invention is, therefore, the obtaining of devices that improve the information associated with the formation of images by means of gamma radiation, and identify their distribution of the radioisotopes, thus overcoming the limitations of known equipment.
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    This object is preferably realized by means of a focusable Compton camera comprising: a Compton dispersion detector; one or more absorption detectors, whose pianos are aligned or not aligned with the plane of the dispersion detector; and a mechanical system of separation of the dispersion and absorption detectors to vary said distance between said detectors. This method is referred to in the present invention as DEC {Dynamic Electronic Collimation), since it offers the advantage of greater efficiency of electronic collimation {Compton Cameras) versus mechanics {Anger Cameras), but also allows to expand the dynamic range of the measure, covering a wider spectrum of efficiencies and spatial resolutions. The possibility of carrying out measurements within the entire dynamic range of the device is what provides additional information and added value compared to existing devices based on electronic collimation.
    Advantageously, in a preferred embodiment of the present invention, the dispersion detector comprises one or more monolithic scintillator crystal (s) or a set of scintillators (pixelated detector) optically coupled to one or more photomultiplier (s) pixelated (s) or one or more semiconductor photosensors based on an array of avalanche photodiodes (APDs) or silicon photomultipliers (or SiPM). On the other hand, the absorption detector comprises a scintillator crystal (monolithic or pixelated) also coupled to a photosensor, both of the pixelated photomultiplier tube type and silicon or SiPM photosensor. This makes it possible to take full advantage of the space of the dispersion and absorption planes as useful detection surfaces, unlike the systems known in the state of the art.
    This compact configuration with low "dead material" or radiation insensitive material has high efficiency, as well as a high intrinsic spatial resolution (sub-millimeter). With these characteristics, a low volume and low weight detection system can be formed, and therefore portable, and which has the fundamental advantage of having a high performance dynamic range. In this way, the invention allows to carry out a measurement procedure where the following steps are performed:
    a) the device is placed in its maximum efficiency configuration, preferably in the geometric center of the room to be measured;
    b) the simultaneous acquisition of positions / energy of the gamma rays and distance between detection planes begins, preferably automatically or continuously varying discretely and at known intervals (dynamic variation) the distance between both detection planes;
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    c) the camera is oriented automatically or discreetly to the directions where greater spatial precision is required.
    As described, the invention has the fundamental advantage of having a high performance dynamic range, for relatively short distances, from a few mm to several cm, between dispersion and absorption detectors. This makes it possible to compose a measure of several sub-measures, each with a different separation between disperser and absorber, giving rise to a global measure composed of several measures, ranging from high-efficiency and low spatial resolution, to high spatial resolution and low efficiency. In this way, it is possible to amplify the detection sensitivity (high efficiency - high spatial resolution) in a single measuring instrument, small, portable and versatile.
    In another preferred embodiment of the invention, the dispersion detector can be of the gaseous type with pixelated electrodes, thus allowing the reconstruction of the Compton electron trajectory by means of time-projection chamber techniques.
    In another preferred embodiment of the invention, the dispersion detector and / or the absorption detector are pixelated semiconductor detectors with segmented electrodes, such as silicon detectors, germanium hyperpure detectors (HPGe), or CdZn, CdZnTe detectors, etc. With this type of detectors, the reconstruction of the Compton electron trajectory can also be feasible, improving the angular resolution and enabling a reconstruction of the image with few events or low statistics.
    By means of the proposed invention, the range of sensitivity (detection efficiency and angular resolution) of the camera and, therefore, of its performance and potential applications is greatly expanded. While in the existing Compton cameras the position of the detectors remains fixed by construction, in the chamber of the invention the operator or user can vary the distance between said detectors, thus extending the spatial resolution capabilities of the device.
    The proposed invention allows, by means of its connection to a corresponding processing electronics, to temporarily distinguish the signals registered in the detection planes, thus being able to identify when said signals have been produced simultaneously. Thus, in a preferred embodiment of the invention, the Compton camera and its associated electronics provide a sufficient capacity for spatial resolution and
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    in the detection of signals, reaching a compromise between the activity (amount of radiation) of the environment to be measured and the sizes of the sensors used.
    In this way, one can start from an initial situation of maximum radiation detection efficiency and low angular or spatial resolution (which can be even zero) at a small distance between the detectors, and gradually increase the focal distance between them, from so that the angular / spatial resolution progressively increases as the detection efficiency decreases. It is based, then, on an initial configuration of the camera to be used as a spectrometer and obtain information about the radioisotopes present on the stage. Subsequently, and depending on the radioisotopes present, the camera allows the detectors to be positioned to obtain the highest resolution image for each of the radioisotopes present, allowing a final composition of maximum spatial resolution to be made with all the individual distributions of these.
    In a preferred embodiment of the invention, each of the detectors is equipped with electronic detection of electrical signals registered by the detectors and conversion of said signals into digital signals. More preferably, the camera additionally comprises an image reconstruction equipment via hardware / software, said equipment comprising a user interface for performing measurements and / or evaluating the results obtained. In this way, it is possible to provide means in the camera that allow an adequate recording and processing of the data associated with the measurements performed.
    In another preferred embodiment of the invention, the mechanical separation system incorporates a piezo motor operated by a mechanical controller.
    In another preferred embodiment of the invention, the Compton camera comprises a portable power system.
    In another preferred embodiment of the invention, the camera comprises a frame or mobile carriage for transportation, equipped with a complementary mechanical guidance system for controlling and recording the spatial orientation of said camera. More preferably, said orientation system comprises a remote control for its operation.
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    In another preferred embodiment of the invention, the dispersion and absorption detectors are mounted on brackets fixed to a linearly sliding plate, operated by means of the mechanical separation system and thus allowing the distance between said detectors to be varied.
    In another preferred embodiment of the invention, the camera comprises a data acquisition system configured with software, to carry out one or more algorithms for reconstruction of the interaction position with the detectors of said camera.
    A second object of the invention relates to the use of a camera according to any of the embodiments described herein, or of several of said cameras connected by hardware / software, for the control or dismantling of areas contaminated by radiation, for monitoring of radioactive leaks or for the acquisition of molecular or dosimetry image.
    A third object of the invention relates to a method of obtaining data about the spatial distribution of a radioisotope, which comprises the use of a camera or a system according to any of the embodiments described herein, and where: it is taken a plurality of measurements of the radiation emitted by the radioisotope with the Compton camera, at different separation distances between the dispersion detector and the absorption detectors; and, based on the radiation measurements obtained for different distances, a spatial reconstruction of the emission distribution of said radioisotope is performed. In this way, the reconstruction algorithm starts from a much more complete amount of information, than in the case of a conventional Compton camera. This method allows obtaining more detailed information on the identification and determination of the spatial distribution of all analyzed radioisotopes.
    DESCRIPTION OF THE FIGURES
    Figure 1 shows a perspective view of the Compton camera of the invention, according to a preferred embodiment thereof.
    Figure 2 shows a graph showing the Compton angle (left ordinate axis, expressed in degrees) and angular dispersion (right ordinate axis, expressed in degrees) versus the separation distance between the dispersion detectors
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    and of absorption (abscissa, represented in mm), for a gamma radiation sampling obtained by means of the chamber of Figure 1.
    - Description of the numerical references of the Figures:
    (1) Compton dispersion detector.
    (2, 2 ’) Radiation absorption detectors.
    (3) Mechanical separation system.
    (4, 4 ’, 4’ ’) Detector stands.
    (5) Sliding plate.
    DETAILED DESCRIPTION OF THE INVENTION
    A detailed description of the invention, referring to a preferred embodiment thereof based on Figure 1 of this document, is set forth below. Said embodiment is provided for illustrative, but not limiting, purposes of the claimed invention.
    As described in previous sections, the Compton chamber of the invention essentially comprises a dispersion detector (1) and one or more absorption detectors (2, 2 ') whose central axes of symmetry are preferably (although not necessarily) aligned. This arrangement of detectors in a Compton camera follows the pattern of known gamma cameras of electronic collimation. In said cameras, each of the detectors (1, 2, 2 ') is equipped with electronic detection and conversion, through which it is possible to convert the electrical pulses registered by the detectors (1, 2, 2') into digital signals, integrated into the device itself. Also, the camera preferably comprises an image reconstruction device via hardware / software that integrates a user interface through which it is possible to make measurements and evaluate the results obtained. Said image reconstruction equipment may be integrated, for example, in a computer.
    The dispersion (1) and absorption (2, 2 ’) detectors are preferably formed by a scintillating crystal, in combination with position sensitive photomultipliers or solid state photomultipliers.
    As described above, the present invention advantageously incorporates a variable separation mechanism of the detection planes formed by the detectors
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    of dispersion (1) and absorption (2, 2 ’), which allows to configure distances (d) included, for example, between 0 and 1 m distance. To do this, both detectors (1, 2, 2 ') are preferably mounted on a mechanical separation system (3) that incorporates a piezo-motor, which allows the aforementioned distance (d) to be varied (which will also be referred to as “ Focal length ”) by means of a mechanical controller and, therefore, know that distance (d) precisely.
    The Compton camera of the invention can operate powered by electric current or by means of a battery, so that the device is fully portable, being able to be carried by hand by the operator, or mounted on a frame or mobile car that allows transport of the set In the case of going on a mobile car, the Compton camera can be mounted on a complementary mechanical orientation system, which allows to control its spatial orientation precisely for the realization of a three-dimensional map of the environment under study. Said positioning can be controlled from the camera's user interface, which in turn can be controlled remotely, by means of physical and wireless connection and / or communication.
    An example of a preferred embodiment of the chamber of the invention is shown, as mentioned, in Figure 1 of this document. The dispersion detector (1) consists, in said embodiment, of a monolithic scintillator crystal or a set of scintillators optically coupled to a photosensor based on an array of avalanche photodiodes (APDs), silicon photomultipliers (or SiPM) or counters of multipfxel photons (MPPC). The absorption detector (2, 2 ’) consists of a scintillator crystal coupled equally to an MPPC.
    Likewise, both detectors (dispersion (1) and absorption (2, 2 ')) are mounted on supports (4, 4', 4 '') that securely hold a plate (5) that can slide linearly along means of the mechanical separation system (3), over a wide range of distances (d). The example shown in Figure 1, this system (3) is connected to a servo controller (not shown in the figure) which, in turn, can be programmed and controlled by a computer with specific software.
    To reconstruct the positions and energies of the radiation interaction in the detectors (1, 2, 2 '), the corresponding electronic reading of the photosensors must be carried out, which can be carried out with data acquisition systems and the application of reconstruction algorithms of the interaction position with said
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    detectors (1,2, 2 ’). Such systems and algorithms and their application to Compton cameras are known in the state of the art.
    To illustrate the results that can be obtained by the camera of the invention, Figure 2 of the present document shows a graph where the Compton angle (left ordinate axis, expressed in degrees) and the angular dispersion (right ordinate axis, expressed in degrees) versus the separation distance (d) between the dispersion (1) and absorption (2, 2 ') detectors, for a radiation sampling obtained by performing Figure 1. The graph shows as, by varying said distance (d) between 0 and 100 mm, it is possible to obtain angular resolutions between 0 and 20 °, for Compton angles in a range between 0 and 180 °.
    Examples of industrial application of the invention:
    Example 1: Dismantling of rooms contaminated by radiation.
    The Compton camera is housed in the center of a room to be analyzed, adjusting its focal length (d) to the minimum. In that configuration, its detection efficiency is maximum. The energies of the gamma transitions that are observed in the energy spectrum are recorded. If the presence of a radionuclide of interest is identified, the focal length (d) is gradually increased in controlled steps. To the extent that it begins to have spatial resolution, the location of the focus of said radioisotope in the room begins to be spatially bounded. The spatial location of the radiation focus for a specific radioisotope can be gradually progressively narrowed as the focal length continues to increase, in case the radiation emitting focus is sufficiently intense to compensate for the loss of efficiency, also progressive.
    Example 2: Radioactive leakage monitoring.
    The Compton camera is located near the place you want to monitor, with the focal length (d) adjusted to the minimum (maximum efficiency for the entire range of energies). The presence or absence of possible contaminating radioisotopes is controlled by the energy spectrum. Once a certain radioisotope of interest is detected, the focal length (d) is progressively increased to spatially limit, progressively, the location of the main focus of said radioisotope.
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    Example 3: In-vivo molecular / dosimetry image.
    It is injected into an animal or patient with a tumor of unknown location, one or more 5 radiotracer compounds, for example F-18-FDG (511 keV), I-131-MIBG (365 keV), Zn-65-porphyrin (1116 keV) or 99mTc (140keV). Next, a global acquisition of the patient is made with the camera while maintaining the minimum focal length (d), identifying the area (s) with the highest instantaneous count. At that point (s), the focal distance (d) is progressively increased, so that the location of said radiotracer is progressively outlined more precisely. Due to the high energy resolution of the chamber, it is possible to distinguish between different types of radiotracers and, therefore, obtain accurate information about the physiology or nature of the tumor.
    权利要求:
    Claims (13)
    [1]
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    1 Focusable Compton camera comprising:
    - a Compton dispersion detector (1);
    - one or more absorption detectors (2, 2 ’), whose pianos are separated from the piano of the dispersion detector (1); Y
    - a mechanical system (3) for variable separation of the dispersion (1) and absorption (2, 2 ′) detectors to modify the distance (d) between said detectors (1,2, 2 ’);
    characterized in that the Compton dispersion detector (1) comprises one or more monolithic scintillator crystals, or a pixelated detector formed by a set of scintillators, optically coupled to one or several pixelated photomultipliers, or to one or several semiconductor photosensors based on a matrix of avalanche photodiodes or silicon photomultipliers;
    and because the absorption detector (2, 2 ’) comprises a monolithic or pixelated scintillator crystal coupled to a photomultiplier tube photosensor, silicon photosensor or silicon photomultiplier.
    [2]
    2. - Camera according to the previous claim, where each of the detectors (1, 2, 2 ') is equipped with electronic detection of electrical signals registered by the detectors (1, 2, 2') and conversion of said signals in digital signals.
    [3]
    3. - Camera according to any one of the preceding claims, which additionally comprises a gamma image reconstruction equipment via hardware / software, said equipment comprising a user interface for performing measurements and / or evaluating the results obtained.
    [4]
    4. - Camera according to any of the preceding claims, wherein the mechanical separation system (3) comprises a piezo-motor operated by a mechanical controller.
    [5]
    5. - Camera according to any of the preceding claims, comprising a portable power system.
    [6]
    6. - Camera according to any of the preceding claims, comprising a frame or mobile carriage for transport.
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    [7]
    7. - Camera according to the previous claim, which comprises a complementary mechanical orientation system for the control and registration of the spatial orientation of said camera.
    [8]
    8. - Camera according to the previous claim, wherein said orientation system comprises a remote control for its operation.
    [9]
    9. - Camera according to any of the preceding claims, wherein the dispersion detector (1) and absorption (2, 2 ') are mounted on supports (4, 4', 4 '') fixed to a plate (5) linearly sliding, operated by means of the mechanical system (3) of separation.
    [10]
    10. - Camera according to any of the preceding claims, comprising a data acquisition system and configured with reconstruction software for the interaction position with the detectors (1,2, 2 ’).
    [11]
    11. - Use of a camera according to any of the preceding claims, or of several of said cameras connected by hardware / software, for the control or dismantling of areas contaminated by radiation, for the monitoring of radioactive leaks or for the acquisition of molecular image or dosimetry.
    [12]
    12. - Method of obtaining data about the spatial distribution of a radioisotope, which comprises the use of a Compton camera according to any of claims 1-10, wherein the following steps are performed:
    - a plurality of measurements of the radiation emitted by the radioisotope with the Compton camera are taken, at different separation distances (d) between the dispersion detector (1) and the absorption detectors (2, 2 ’); Y
    - a spatial reconstruction of the emission distribution of said radioisotope is carried out from the radiation measurements obtained for different distances (d).
    [13]
    13. - Method according to the previous claim where the following steps are also carried out:
    - the camera is placed in its configuration of dispersion detectors (1) and absorption detectors (2, 2 ’) of maximum efficiency;
    - the simultaneous acquisition of positions / energy of the gamma rays and distance (d) between detecting pianos of the detectors (1, 2, 2 ’) begins, varying said distance (d), continuously or discretely;
    - the camera is oriented, during the measurement stage, towards the 5 directions where greater spatial precision is required.
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    同族专利:
    公开号 | 公开日
    ES2626044B1|2018-05-03|
    WO2017109256A1|2017-06-29|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US8338795B1|2008-09-24|2012-12-25|Sandia Corporation|Method for improving the angular resolution of a neutron scatter camera|
    US20120256094A1|2011-04-06|2012-10-11|Sara Pozzi|Dual-particle imaging system for standoff snm detection in high-background-radiation environments|
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    PCT/ES2016/070916| WO2017109256A1|2015-12-21|2016-12-21|Focusable compton camera equipped with variable separation detectors|
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