Gamma-ray position readout device and gamma-ray position readout system

Abstract

The invention discloses a gamma ray position readout device and a gamma ray position readout system, wherein the gamma ray position readout device includes: a signal processing module, the signal processing module is used for SSPM gamma ray The current signal output by the detector is processed, and an amplitude discrimination signal and a gate output signal are output; a discrimination module, the discrimination module is used to discriminate the amplitude discrimination signal according to a preset signal, and outputs a first control signal and a second control signal; A switch module, the switch module is used to close the corresponding switch according to the first control signal and the second control signal to output the strobe output signal. The gamma-ray position readout device of the present invention can only gate the SSPM gamma-ray detector array unit whose current signal is higher than the preset signal, greatly reducing the influence of dark noise on the position resolution of the detector, and greatly The application range of SSPM detectors in gamma detection is extended.

Description

technical field [0001] The invention relates to the technical field of gamma ray detection, in particular to a gamma ray position readout device and a gamma ray position readout system. Background technique [0002] In nuclear medicine imaging systems such as PET (Positron Emission Compute3Tomography, positron emission computed tomography), it is often necessary to detect the position, such as the direction, of gamma rays, and determine the distribution image of the gamma ray source through reconstruction. When detecting gamma rays, the position accuracy of gamma rays will directly affect the final resolution of the image. Generally, a PET imaging device uses a gamma ray detector to detect the position of the gamma ray, and the gamma ray detector is mainly composed of a scintillation crystal and a photoelectric conversion device. Specifically, after the scintillation crystal converts the gamma ray into scintillation light with a wavelength in the range of 300-600nm, the pho...

AI Technical Summary

Problems solved by technology

[0004] Solution 1 in the related art has the following problems: the PMT quantum efficiency is low, the size is large, and it is sensitive to magnetic fields

Although SSPM can solve the above-mentioned shortcomings of PMT, the dark noise of SSPM is very large, for example, the dark noise count rate of 1 SSPM gamma ray detector array unit is as high as 10 7 , therefore, if the output signals of these SSPM gamma-ray detector array units are directly summed by using resistor network shunts, then the dark noise of all detector array units will be accumulated, making the position resolution seriously degraded

In addition, the dark noise of SSPM is very sensitive to temperature, which makes the position resolution very sensitive to temperature. At this time, the position of gamma rays will not be detected accurately

Images