SiPM (Silicon Photomultiplier)-based nuclear medical imaging plate flat panel detector

Abstract

The invention discloses a SiPM (Silicon Photomultiplier)-based nuclear medical imaging plate flat panel detector, which comprises multiple detection modules and a processing circuit module, wherein each detection module comprises a scintillation crystal array and a SiPM array coupled with the scintillation crystal array, the scintillation crystal array comprises multiple scintillation crystals for detecting gamma rays and generating optical signals, and the SiPM array comprises multiple SiPMs for converting the optical signals generated through the scintillation crystal array into electric signals; and the processing circuit module receives and processes the electric signals from the SiPMs to generate output signals as a detection result, and comprises a passive processing circuit module and an active processing circuit module arranged separately, the active processing circuit module leads out the electric signals generated by the SiPM array, and the active processing circuit module receives and processes the electric signals from the passive processing circuit module and generates the output signals. the flat panel detector of the invention has the advantages of compact structure, good performance and strong stability.

Description

technical field [0001] The present disclosure generally relates to the field of detection technology, and in particular relates to a SiPM-based nuclear medical imaging flat panel detector. Background technique [0002] Nuclear medicine imaging is a non-invasive medical imaging technology based on the molecular level. Its imaging methods mainly include positron emission imaging PET (Positron Emission Computed Tomography), single photon emission tomography SPECT (Single-Photon Emission Computed Tomography) and gamma camera (Gamma Camera). PET detects the accumulation concentration and position information of positron tracer drugs through detectors, and uses image reconstruction technology to obtain image information, which represents the highest level in the field of nuclear medicine imaging. SPECT or gamma cameras use collimators to collect information on single-photon tracer drugs to obtain tracer distribution information with high precision. In the above two types of imagi...

AI Technical Summary

Problems solved by technology

[0005] However, due to the obvious temperature effect of the SiPM, the way the analog circuit board is placed close to the SiPM will easily cause a large amount of heat generated by the circuit to affect the stability of the SiPM through heat conduction between the boards, and ultimately affect the performance of the detector; limited by the SiPM's own junction capacitance performance, If the splicing of the array is too large, the signal pulse will be broadened accordingly, and signal accumulation will easily occur in the application of high count rate local imaging PET, resulting in a decrease in the system count rate performance; in addition, the single-ended output of the analog signal to the digital circuit part, if the shielding effect Not good enough, susceptible to interference from the environment

Therefore, when designing the detector, due to the obvious thermal effect of SiPM and the single-ended output analog signal is easily disturbed by the external environment, the problem of unstable detector performance needs to be solved urgently.

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