Pulse accumulation event real-time processing method and system

Abstract

A pulse accumulation event real-time processing method includes the steps of generating a fitting baseline value look-up table and a fitting energy value look-up table of a pulse falling edge, completing the recognizing of accumulated pulses and the triggering of the pulse signal processing process through a multi-voltage threshold value sampling method, obtaining information of a part not correctly sampled due to pulse accumulation through pulse prior information and collected pulse information in the form of the look-up tables, and completing real-time recovery of accumulated pulse information. The recognizing of high-counting-rate lower accumulated pulses and the triggering of the pulse signal processing process are completed through the multi-voltage threshold value sampling method, the information of the part not correctly sampled due to pulse accumulation is obtained through pulse prior information and collected pulse information in the form of the look-up tables, and the real-time recovery of the accumulated pulse information is completed. The method is simple and efficient and can be easily implemented on a detector-level real-time data collecting system, and an excellent accumulated pulse information recovery effect can still be achieved under the condition of a low sampling rate.

Description

technical field [0001] The invention relates to the field of digital signal processing, in particular to a method and system for real-time processing of pulse accumulation events based on multi-voltage threshold sampling technology. Background technique [0002] In the field of high-energy particle detection and nuclear medical imaging fields such as Positron Emission Tomography (PET), it is necessary to complete the detection of gamma photon information. Usually, scintillation crystals are used to convert gamma photons into visible light photons, which are then converted into photons by photoelectric conversion devices. The scintillation pulse electrical signal is finally extracted by the data acquisition circuit corresponding to the gamma photon information contained in the scintillation pulse electrical signal. [0003] Counting performance is one of the basic performance indicators of high-energy particle detectors, which reflects the limit of the number of events that t...

AI Technical Summary

Problems solved by technology

[0009] When the dynamic integration method and the DiSER method are applied to position-sensitive detectors, they will face the processing synchronization problem of multiple homologous scintillation pulse signals generated by a gamma photon event, such as the position-sensitive photomultiplier tube (PhotomultiplierTube, referred to as PMT) will generate a group of angular pulse signals containing position information after receiving the gamma photons, and the angular pulse signal waveforms of the same group are different. Using the above method is likely to cause only part of the pulses to be triggered and subsequently processed, and because each The angle pulse signal is triggered independently, causing the trigger time to be out of sync, which deteriorates the accuracy of energy and position information

In addition, the above two methods need to collect a certain period of data frame and then play back the data to determine the occurrence time of the accumulation pulse, and the real-time processing of the accumulation pulse cannot be performed on the detector.

[0010] The method of using the detector system response function and iterative algorithm for pulse recovery has high requirements on the sampling rate of the digitized scintillation pulse process, and the iterative algorithm takes a lot of time, which makes the realization of this method on detectors and systems that require real-time processing There are difficulties

[0011] The baseline update process of the pulse accumulation baseline drift processing method based on pulse baseline value statistics requires a certain response time, which can only reduce the impact of baseline drift caused by pulse tailing, and cannot perform real-time recovery processing on pulses when pulse accumulation occurs

Images