CN219397309U - Positron emission tomography equipment detector and imaging equipment - Google Patents
Positron emission tomography equipment detector and imaging equipment Download PDFInfo
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- CN219397309U CN219397309U CN202320297601.8U CN202320297601U CN219397309U CN 219397309 U CN219397309 U CN 219397309U CN 202320297601 U CN202320297601 U CN 202320297601U CN 219397309 U CN219397309 U CN 219397309U
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Abstract
The embodiment of the application provides a positron emission tomography equipment detector and imaging device, belongs to medical instrument technical field, includes: the photoelectric signal conversion module, the conversion circuit module, the front-end circuit module, the control module and the water cooling module; the photoelectric signal conversion module comprises a signal receiving end and a signal output end, one end of the conversion circuit module is connected with the signal output end, and the other end of the conversion circuit module is connected with the front-end circuit module; the photoelectric signal conversion module further comprises a crystal layer, the crystal layer comprises a plurality of crystal strips spliced with each other, one end of each crystal strip is provided with a light guide layer, and the other end of each crystal strip is provided with a signal receiving layer; the crystal strip is provided with a first reflecting layer along the length direction of the crystal strip, and one side of the light guide layer, which is away from the crystal strip, is provided with a second reflecting layer. According to the detector and the imaging device of the positron emission tomography device, provided by the embodiment of the application, the depth effect correction function can be realized, and the spatial resolution of the positron emission tomography device is improved.
Description
Technical Field
The embodiment of the application relates to the technical field of medical instruments, in particular to a positron emission tomography equipment detector and imaging equipment.
Background
Positron emission tomography (Positron Emission Tomography, PET) is a commonly used nuclear medicine imaging device widely used in the diagnosis of tumor, brain and heart diseases, and is based on the principle of injecting glucose labeled with radioactive nucleic acid into a subject (such as those commonly used in clinic) 18 F-FDG)， 18 F can not exist stably, and can release positrons, and the positrons can generate annihilation when meeting with free negative electrons, so that a pair of gamma photons with the same energy and opposite directions are generated, the pair of gamma photons can be captured through a pair of PET detectors which are arranged oppositely, and the image reconstruction of a focus can be realized through a large number of acquisitions.
The PET detector mainly comprises a scintillation crystal, a photoelectric conversion device and a data processing front-end circuit. Wherein the scintillation crystal is responsible for converting 511keV of high energy gamma photons into visible photons. To achieve higher sensitivity, the scintillation crystal is designed with a certain thickness. When photons are incident obliquely to the crystal, photons may pass through multiple crystals, and due to lack of depth information, if a fixed location in the crystal is used in image reconstruction, this may cause inaccurate Line of Response (LOR) registration, which may further cause a reduction in the resolution of the reconstructed image, which is the depth effect (Depth Of Interaction, DOI).
The DOI correction technique usually adopts a multi-layer crystal or double-end reading mode for performing the approach correction, but the two methods have the problems of high cost and certain application limitations.
Disclosure of Invention
The embodiment of the application provides a positron emission tomography equipment detector and imaging equipment, aiming at reducing the cost of depth effect correction and improving correction accuracy.
A first aspect of embodiments of the present application provides a positron emission tomography apparatus detector, comprising:
the device comprises a photoelectric signal conversion module, a conversion circuit module, a front-end circuit module, a control module and a water cooling module; the control module is connected with the front-end circuit module and is used for collecting and processing data output by the front-end circuit module; the water cooling module is used for cooling the front-end circuit module;
the photoelectric signal conversion module comprises a signal receiving end and a signal output end, one end of the conversion circuit module is connected with the signal output end, and the other end of the conversion circuit module is connected with the front-end circuit module;
the photoelectric signal conversion module further comprises a crystal layer, wherein the crystal layer comprises a plurality of mutually spliced crystal strips, one end of each crystal strip is provided with a light guide layer, and the other end of each crystal strip is provided with a signal receiving layer;
the crystal strip is provided with a first reflecting layer along the length direction of the crystal strip, and one side of the light guide layer, which is away from the crystal strip, is provided with a second reflecting layer.
Optionally, the detector further comprises: the first heat conduction piece is arranged between the photoelectric signal conversion module and the conversion circuit module and is used for radiating the signal receiving layer.
Optionally, the water cooling module includes: the first radiating plate and the second radiating plate are respectively arranged on two sides of the front-end circuit module, and water cooling pipelines are arranged on the first radiating plate and the second radiating plate.
Optionally, the water cooling pipes are distributed on the first heat dissipation plate and the second heat dissipation plate in a serpentine shape.
Optionally, the water cooling pipeline comprises an inlet end and an outlet end, and the inlet end and the outlet end are both arranged along a direction perpendicular to the photoelectric signal conversion module.
Optionally, the detector further comprises: the second heat conduction piece is arranged on the surface, facing the front-end circuit module, of the first heat dissipation plate, and the second heat conduction piece is used for dissipating heat of the front-end circuit module.
A second aspect of an embodiment of the present application provides a positron emission tomography apparatus comprising a mounting ring and a plurality of positron emission tomography apparatus detectors as provided in the first aspect of an embodiment of the present application disposed on the mounting ring.
The beneficial effects are that:
the application provides a positron emission tomography equipment detector and imaging equipment, through setting up photoelectric signal conversion module, converting circuit module, front end circuit module, control module and water-cooling heat dissipation module, wherein photoelectric signal conversion module includes the crystal layer, and the crystal layer includes a plurality of crystal strips of mutually concatenation, and one end of crystal strip is provided with the photoconductive layer, and the other end is provided with the signal receiving layer; when the detector is used, gamma photons generate visible light photons after entering the crystal strips, one part of the visible light is received by the signal receiving layer connected with the light emitting surface of the current crystal strip, the other part of the visible light enters the light guiding layer along the length direction of the crystal, enters other crystal strips after refraction, and is finally received by the signal receiving layer connected with the corresponding crystal strips; therefore, optical signal sharing is realized among different crystal strips, DOI is realized through optical distribution calculation, a large number of detector components can be saved, the cost is low, and meanwhile, the correction precision can be improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments of the present application will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a detector for a positron emission tomography apparatus according to an embodiment of the present application;
FIG. 2 is a schematic diagram of a front view of a detector of a positron emission tomography apparatus according to an embodiment of the present application;
FIG. 3 is a schematic diagram illustrating a structure of a photoelectric signal conversion module in a detector of a positron emission tomography apparatus according to an embodiment of the present application;
FIG. 4 is a schematic top view of a crystal layer of a detector of a positron emission tomography apparatus according to an embodiment of the application;
FIG. 5 is a schematic diagram illustrating the propagation of an optical path of a photoelectric signal conversion module in a detector of a positron emission tomography apparatus according to an embodiment of the present application;
FIG. 6 is a schematic side view of a detector for a positron emission tomography apparatus according to an embodiment of the present application;
FIG. 7 is a schematic diagram of a water-cooled pipeline in a detector of a positron emission tomography apparatus according to an embodiment of the present application;
fig. 8 is a schematic structural diagram of a positron emission tomography apparatus according to an embodiment of the present application.
Reference numerals illustrate: 1. a photoelectric signal conversion module; 11. a crystal layer; 111. a crystal bar; 12. a light guiding layer; 13. a signal receiving layer; 2. a conversion circuit module; 3. a front-end circuit module; 4. a first heat conductive member; 5. a first heat dissipation plate; 6. a second heat dissipation plate; 7. a water-cooled pipeline; 71. an inlet end; 72. an outlet end; 8. a second heat conductive member; 100. a mounting ring; 101. a detector.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
Referring to fig. 1 and 2, a positron emission tomography apparatus detector disclosed in an embodiment of the present application, the detector 101 includes a photoelectric signal conversion module 1, a conversion circuit module 2, a front-end circuit module 3, a control module 9, and a water cooling module.
Specifically, referring to fig. 3 and 4, the photoelectric signal conversion module 1 includes a crystal layer 11, and the crystal layer 11 includes a plurality of crystal bars 111 spliced with each other. The plurality of crystal bars 111 are spliced together along their respective length directions, and the length and size of each crystal bar 111 are the same, and the finally spliced crystal layer 11 may be a rectangular body. Meanwhile, a first reflective layer is disposed on the outer sidewall of each crystal bar 111 along the length direction of the crystal bar 111, and has a reflective effect, and after gamma photons enter the crystal bar 111 to generate visible photons, the visible photons can be reflected and transmitted inside the crystal bar 111. The first reflective layer may include a diffuse reflective layer and a specular reflective layer, and may be selected by those skilled in the art according to actual needs. The material of the first reflecting layer can be barium sulfate.
Further, referring to fig. 3, one end of the plurality of crystal stripes 111 is provided with a light guiding layer 12, and the material of the light guiding layer 12 may include glass. The light guiding layer 12 covers the ends of all the crystal stripes 111 and a second reflective layer is also provided on the side of the light guiding layer 12 facing away from the crystal stripes. Referring to fig. 4, after the light photons propagate into the light guiding layer 12, the light photons may continue to propagate and reflect through the light guiding layer 12 and into other crystal stripes 111. The material of the second reflecting layer can be silver reflecting film.
Further, as shown with reference to fig. 3, the other ends of the plurality of crystal stripes 111 (i.e., the ends remote from the photoconductive layer) are provided with signal receiving layers 13. The signal receiving layer 13 may receive photons of visible light propagating through the crystal stripes 111 and generate and output data information.
Illustratively, referring to fig. 5, gamma photons generate visible photons after entering a certain crystal stripe 111, a part of the visible photons are received by a signal receiving layer 13 connected to the light-emitting surface of the current crystal stripe 111, and another part of the visible photons enter a light guiding layer 12 along the length direction of the crystal stripe 111, enter other crystal stripes 111 after being refracted, and are finally received by the signal receiving layer 13 connected to the corresponding crystal stripe 111, and at this time DOI information can be calculated by the following formula:
wherein P is max A signal receiving layer 13 signal indicating the received maximum amount of light; p represents the sum of all the signals of the signal receiving layer 13.
It should be noted that, in the embodiment of the present application, each crystal block corresponds to one signal receiving layer, and the ratio of the number of crystal bars in each crystal block to the number of pixels of the signal receiving layer is 1:1, which are in one-to-one correspondence.
Further, the photoelectric signal conversion module 1 includes a signal receiving end and a signal output end, wherein one end of the conversion circuit module 2 is connected to the signal output end, and the other end is connected to the front-end circuit module 3.
Specifically, in practical application, the side of the signal receiving layer 13 is a signal output end, and the position of the input signal of the opposite photoelectric signal conversion module 1 is a signal receiving end. After the signal output end transmits the signal to the conversion circuit module 2, the conversion circuit module 2 converts the signal into an electrical signal, and then transmits the converted signal to the front-end circuit module 3, and performs data analysis and processing through the front-end circuit module 3.
Further, in the embodiment of the present application, referring to fig. 1, two sets of front-end circuit modules 3 are provided in total, and the two sets of front-end circuit modules 3 adopt a vertically arranged scheme, and a certain distance is provided between the two sets of front-end circuit modules 3 for arranging a heat dissipation assembly.
Further, in the embodiment of the present application, the front-end circuit module 3 includes front-end circuit boards, and there are 10 ASIC (Application Specific Integrated Circuit ) chips on each front-end circuit board, so there are 20 ASIC chips for each detector, and the corresponding photoelectric conversion modules 1 are also 20. Further, the control module 9 is connected to the front-end circuit module 3, and the control module 9 is used for collecting and processing data output by the front-end circuit module 3.
Specifically, the control circuit of the control module 9 uses an FPGA (Field Programmable Gate Array ) as a main control and embedded processor, and adopts an SPI (Serial Peripheral interface ) protocol signal to configure and control the system acquisition of the ASIC chip and acquire the multipath data output of the ASIC; and processing the acquired data and outputting the processed data to the next stage. In addition, the FPGA is also used for acquiring a temperature signal and monitoring the state of the front-end circuit module 3.
Further, the water cooling module is used for cooling the ASIC chip in the front-end circuit module 3, so as to ensure the normal operation of the front-end circuit module 3.
By the positron emission tomography equipment detector provided by the embodiment of the application, optical signal sharing is realized among different crystal strips 111, and the incidence position of gamma photons is determined through light distribution calculation. Compared with a double-end reading mode, the method can save a large number of detector components, has lower cost and higher correction precision. In an alternative implementation, referring to fig. 1, the embodiment of the present application further provides a positron emission tomography apparatus detector, where the detector 101 further includes a first heat conducting member 4, and the first heat conducting member 4 is disposed between the photoelectric signal conversion module 1 and the conversion circuit module 2.
Specifically, the first heat conducting member 4 may radiate heat from the signal receiving layer 13, so as to ensure the normal operation of the photoelectric signal conversion module 1, and the first heat conducting member 4 may be an aluminum heat conducting member.
Further, referring to fig. 1 and 6, the water cooling module includes a first heat dissipation plate 5 and a second heat dissipation plate 6, where the first heat dissipation plate 5 and the second heat dissipation plate 6 are respectively disposed on two sides of the front end circuit module 3, in this embodiment, two sets of front end circuit modules 3 are disposed, and therefore, two sides of the two sets of front end circuit modules 3 are respectively disposed with the first heat dissipation plate 5 and the second heat dissipation plate 6.
Specifically, referring to fig. 7, the first heat dissipation plate 5 and the second heat dissipation plate 6 are provided with water cooling pipes 7, the water cooling pipes 7 penetrate through the first heat dissipation plate 5 and the second heat dissipation plate 6, and the water cooling pipes 7 are distributed on the first heat dissipation plate 5 and the second heat dissipation plate 6 in a serpentine shape, so that the contact area of the water cooling pipes 7 can be increased, and the heat dissipation capacity is improved; meanwhile, the water-cooling pipe 7 includes an inlet end 71 and an outlet end 72, and the inlet end 71 and the outlet end 72 are disposed in a direction perpendicular to the photoelectric signal conversion module 1, so that the inlet end 71 and the outlet end 72 do not interfere with the space at both axial ends of the detector.
Further, referring to fig. 6, the probe 101 further includes a second heat conducting member 8, where the second heat conducting member 8 is disposed on a surface of the first heat dissipation plate 5 facing the front-end circuit module 3, and the second heat conducting member 8 is configured to dissipate heat from the front-end circuit module 3.
Specifically, the second heat conducting member 8 may be a red copper heat conducting member, and the second heat conducting member 8 is attached to the chip of the front-end circuit module 3 to enhance the heat dissipation effect thereof.
Based on the same inventive concept, referring to fig. 8, an embodiment of the present application discloses a positron emission tomography apparatus including a mounting ring 100 and a plurality of positron emission tomography apparatus detectors as described in the foregoing of the embodiment of the present application.
Specifically, the inside of the mounting ring 100 is provided with a plurality of mounting grooves along the circumferential direction, and each of the probes 101 is mounted in a separate one of the mounting grooves (only one of the probes 101 is shown in the drawing).
It should be noted that, in the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described as different from other embodiments, and identical and similar parts between the embodiments are all enough to be referred to each other.
It should also be noted that, in this document, the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," and the like indicate an orientation or a positional relationship based on that shown in the drawings, and are merely for convenience of description and to simplify the description, but do not indicate or imply that the apparatus or elements to be referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application. Moreover, relational terms such as "first" and "second" may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions, or order, and without necessarily being construed as indicating or implying any relative importance. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or terminal device comprising the element.
The foregoing has outlined rather broadly the more detailed description of the present application, and the detailed description of the principles and embodiments herein may be better understood as being a limitation on the present application. Also, various modifications in the details and application scope may be made by those skilled in the art in light of this disclosure, and all such modifications and variations are not required to be exhaustive or are intended to be within the scope of the disclosure.
Claims (7)
1. A positron emission tomography apparatus detector, comprising:
the device comprises a photoelectric signal conversion module, a conversion circuit module, a front-end circuit module, a control module and a water cooling module; the control module is connected with the front-end circuit module and is used for collecting and processing data output by the front-end circuit module; the water cooling module is used for cooling the front-end circuit module;
the photoelectric signal conversion module comprises a signal output end, one end of the conversion circuit module is connected with the signal output end, and the other end of the conversion circuit module is connected with the front-end circuit module;
the photoelectric signal conversion module further comprises a crystal layer, wherein the crystal layer comprises a plurality of mutually spliced crystal strips, one end of each crystal strip is provided with a light guide layer, and the other end of each crystal strip is provided with a signal receiving layer;
the crystal strip is provided with a first reflecting layer along the length direction of the crystal strip, and one side of the light guide layer, which is away from the crystal strip, is provided with a second reflecting layer.
2. The positron emission tomography apparatus detector of claim 1, wherein the detector further comprises:
the first heat conduction piece is arranged between the photoelectric signal conversion module and the conversion circuit module and is used for radiating the signal receiving layer.
3. The positron emission tomography apparatus detector of claim 1, wherein the water cooled heat sink module comprises:
the first radiating plate and the second radiating plate are respectively arranged on two sides of the front-end circuit module, and water cooling pipelines are arranged on the first radiating plate and the second radiating plate.
4. A positron emission tomography apparatus detector as claimed in claim 3, wherein:
the water cooling pipelines are distributed on the first radiating plate and the second radiating plate in a serpentine shape.
5. The positron emission tomography apparatus detector as claimed in claim 4, wherein:
the water cooling pipeline comprises an inlet end and an outlet end, and the inlet end and the outlet end are arranged along the direction perpendicular to the photoelectric signal conversion module.
6. The positron emission tomography apparatus detector of claim 3, wherein the detector further comprises:
the second heat conduction piece is arranged on the surface, facing the front-end circuit module, of the first heat dissipation plate, and the second heat conduction piece is used for dissipating heat of the front-end circuit module.
7. A positron emission tomography apparatus, characterized in that:
a plurality of positron emission tomography apparatus detectors as claimed in any of claims 1 to 6 including a mounting ring and disposed on the mounting ring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202320297601.8U CN219397309U (en) | 2023-02-13 | 2023-02-13 | Positron emission tomography equipment detector and imaging equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202320297601.8U CN219397309U (en) | 2023-02-13 | 2023-02-13 | Positron emission tomography equipment detector and imaging equipment |
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| CN219397309U true CN219397309U (en) | 2023-07-25 |
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| CN202320297601.8U Active CN219397309U (en) | 2023-02-13 | 2023-02-13 | Positron emission tomography equipment detector and imaging equipment |
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