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A multi-gamma photon coincidence imaging system and method

A gamma photon, imaging system technology, applied in medical science, diagnosis, computed tomography scanners, etc., can solve the problems of low signal-to-noise ratio of detection data and low detection efficiency of multi-photon coincidence events, so as to improve the signal-to-noise ratio, The effect of reducing radionuclide doses, reducing the need for total counts

Active Publication Date: 2020-07-28
TSINGHUA UNIV
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Problems solved by technology

However, since each detector head of the system contains a collimator module that limits the direction of photons, the detection efficiency of multi-photon coincidence events is extremely low, resulting in low signal-to-noise ratio of detection data

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  • A multi-gamma photon coincidence imaging system and method
  • A multi-gamma photon coincidence imaging system and method

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Embodiment 1

[0026] The overall structure of the imaging system of this embodiment is as follows figure 1 As shown, the system consists of a gamma detector probe and a Compton camera detector probe 5 arranged perpendicularly to each other in the detection plane, a time coincidence module 6 and a computer platform 7; the gamma detector probe consists of a parallel hole collimator 1 and a gamma photon detector 2 with a time measurement function, the parallel hole collimator 1 is placed on the front end of the gamma photon detector 2 so that the gamma photons produced by the decay of the radionuclide in the imaging object 8 can only travel along the direction perpendicular to the gamma photon The gamma photon detector 2 can only be detected by the gamma photon detector 2 when it emits in the direction of the plane; the Compton camera detector probe 5 consists of a front-end Compton camera detector 3 with a time measurement function and a back-end Compton camera detector 4 components, the gamm...

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Abstract

The invention discloses a multi-gamma photon coincidence imaging system and a multi-gamma photon coincidence imaging method, and belongs to the technical field of emission computed tomography. The system comprises a time coincidence module, a computer platform, at least one first probe consisting of a collimator and a gamma photon detector as well as at least one second probe consisting of front and back Compton camera detectors; and each probe detects multiple gamma photons radiated by radionuclide to form a multi-gamma photon coincidence event. According to the imaging method, the range of the position where the radionuclide decays is shrunk into a plurality of intersection points of a projection line determined by the gamma photon event detected by the first probe in the multi-gamma photon coincidence event as well as a protection conical surface determined by the gamma photon event detected by the second probe, and a certain number of multi-gamma photon coincidence events are accumulated to obtain the images, distributed in the detected range, of the radionuclide. The reconstruction algorithm is simplified, the detection efficiency is improved, the signal-to-noise ratio of thereconstructed image is increased, and demand on the total count of the gamma photons is reduced.

Description

technical field [0001] The invention belongs to the technical field of emission tomography, in particular to a multi-gamma photon coincidence imaging system and method. Background technique [0002] Emission tomography is one of the important technologies for detecting internal information of objects today, and has a large number of applications in many research fields. By detecting the gamma photons emitted from the detected object outside the detected object and reconstructing the image, the internal information of the detected object can be observed in a non-invasive way. In the field of emission tomography, the most important imaging systems are Positron Emission Tomography (hereinafter referred to as PET) and Single-Photon Emission Computed Tomography (hereinafter referred to as SPECT). And Compton Camera (Compton Camera), etc. At present, both PET and SPECT have been widely used in clinical examination and diagnosis, including cancer, nervous system diseases and card...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61B6/03
CPCA61B6/037A61B6/5205
Inventor 刘亚强马天予刘潇
Owner TSINGHUA UNIV
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