PET detector based on crystal side coupling SiPM, and reading method thereof

Abstract

The invention belongs to the technical field of medical imaging equipment, and particularly relates to a PET detector based on crystal side coupling SiPM, and a reading method thereof. The detector comprises a crystal array, a SiPM side coupling array, a front-end reading circuit and a data acquisition system; the crystal array is used for receiving gamma rays and enabling the gamma rays to deposit energy in the crystal array to generate visible light; the SiPM side coupling array is used for converting visible light into an electric signal; the front-end reading circuit is used for performing amplification forming, discrimination and analog-to-digital conversion processing on the electric signals output by the SiPM side coupling array to obtain time and energy information; and the data acquisition system is used for calculating the signal digital information obtained by the front-end reading circuit to obtain final energy, time and position information. The transition time of photons in the crystal can be reduced, and the time resolution performance and the light collection efficiency can be improved.

Description

technical field [0001] The invention belongs to the technical field of medical imaging equipment, and in particular relates to a PET detector based on crystal side-coupled SiPM and a readout method thereof. Background technique [0002] At present, silicon photomultiplier tube (Silicon Photomultiplier, SiPM) detectors are increasingly used in Positron Emission Tomography (PET) due to their good energy and time resolution and magnetic compatibility. system. The principle is to use the high-energy Gamma photons captured by the detector crystal module to convert the low-energy visible light signal into an electrical signal through SiPM, and then use the energy measurement device and time measurement device (Time-Digital Converter, TDC) to obtain the electrical signal. Energy and arrival time information. Then, the effective signal is screened out by means of back-end coincidence selection and other methods, and then the precise position of photon generation is obtained throug...

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the problems in the prior art that the traditional PET detector adopts the end-face coupling scheme, which causes the time measurement performance of the PET system to be low, and it is difficult to meet the high-precision time measurement resolution, and provides a method that can reduce the photon Transit time in crystals, crystal side-coupled SiPM based PET detectors with enhanced time resolution performance and light collection efficiency and their readout method

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