Signal processing equipment of PET detector based on neural network localizer

Abstract

The invention provides signal processing equipment of a PET detector based on a neural network localizer. The equipment integrates and realizes procedures for processing a series of signals from a photoelectric switching signal outputted by a detector to the action position coordinate of the gamma ray counted by a neural network in real time. The equipment comprises a compression read processing circuit to an array pixel signal outputted by a photoelectric switching device, an analog-digital switching circuit, an energy identifying and timing circuit, a proper time judging circuit, a base line recovery circuit, a signal peak value estimating circuit, a neural network real-time computing circuit, a USB interface circuit, etc. Due to the realization of the technology for processing various digital nuclear signals based on FPCA and especially the real-time computing of the neural network, the instantaneity and the integration level of the system are greatly improved. The invention has compact structure, complete performance, strong on-line data processing performance, and can be conveniently assembled into an integral detector module with the PET detector, wherein the detector module is important intermediate equipment for researching and developing novel PET imaging equipment based on neural network positioning.

Description

technical field [0001] The invention relates to the field of nuclear signal processing, and further belongs to high-resolution PET detector module real-time signal processing electronic equipment. Background technique [0002] Positron Emission Tomography PET (Positron Emission Tomography) is a nuclear medical imaging technique that plays an important role in the early detection and inspection of diseases. Small animal PET, which is used for the study of the nature of life phenomena, disease pathology and drug mechanism, has received more and more attention in recent years. Compared with human PET for clinical disease diagnosis, small animal PET has higher requirements on the position resolution of the detector. At present, the position resolution of the high-resolution PET detector module can be achieved below 2mm, and the crystal structure mostly adopts the method of dividing the crystal. Since the split crystal method needs to fill light-shielding materials between the ...

AI Technical Summary

Problems solved by technology

Since the split crystal method needs to fill light-shielding materials between the crystals to reduce the optical crosstalk between the crystal strips, the effective detection area of ​​the detector is reduced, resulting in a decrease in detection efficiency.

The use of a single continuous crystal reduces the dead space, which can significantly improve the detection efficiency and energy resolution, but the positioning accuracy of the gamma-ray action position on the bulk scintillator has always been the focus of research and development based on bulk scintillator detectors

Such a combined system has low integration and does not have real-time computing capabilities, and cannot meet the needs of combining multiple PET detector modules to form a new high-resolution PET imaging instrument.

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