Method for quickly determining action depth positioning resolution of double-end readout detector

Abstract

The invention discloses a method for quickly determining the action depth positioning resolution of a double-end readout detector. The method comprises the steps: adopting a non-collimation source toirradiate the detector and collecting a certain number of gamma photon events; recording the output of the photoelectric conversion devices at the two ends of the crystal of each gamma photon event; calculating statistical distribution of output signal differences of the photoelectric conversion devices at the two ends; and extracting two boundary positions of the statistical distribution, measuring the energy resolution of the detector module to the corresponding energy ray source by using non-collimation source measurement data, and quickly calculating the action depth positioning resolutionof the detector module by combining the relationship between the action depth positioning resolution and the parameters. Compared with the prior art, the method does not depend on a collimation gammasource, and makes the related factors of the action depth positioning resolution represented by the statistical broadening degree of the output difference of the photoelectric conversion devices at the two ends, and finally, a correlation relationship with the energy resolution of the gamma rays with the corresponding energy is established with the detector module so as to quickly determine the action depth positioning resolution of the double-end readout detector.

Description

technical field [0001] The invention belongs to the technical field of measuring physical parameters in crystal detectors, in particular, the invention relates to a method for quickly determining the positioning resolution of the action depth of a double-end readout detector. Background technique [0002] Currently, the depth-of-interaction (Depth-of-Interaction, DOI) detector (DOI detector) is of great significance for improving the imaging performance of the gamma imaging system. For example, in a Positron Emission Tomography (PET) scanner, the use of a ray-action depth detector can effectively reduce the influence of the parallax effect (Parallax Effect), thereby improving the spatial resolution of the gamma imaging system. In the Compton camera imaging system, the use of the ray interaction depth detector can improve the accuracy of the scattering direction of the obtained Compton scattered photons, thereby improving the accuracy of the direction positioning information ...

AI Technical Summary

Problems solved by technology

[0008] Due to the need to use a collimated radiation source, the measurement process of the positioning resolution of the action depth is cumbersome and time-consuming, and it is impossible to quickly judge the pros and cons of different double-ended readout detector module designs, and it is easy to introduce collimation errors that affect all Accuracy of calculated depth of action positioning resolution

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