A method and system for real-time processing of pulse accumulation events

Abstract

A method for real-time processing of pulse accumulation events, comprising the steps of: generating a fitted baseline value lookup table and a fitted energy value lookup table for pulse falling edges, using a multi-voltage threshold sampling method to complete the identification of piled-up pulses and the triggering of the pulse signal processing process ; Using the pulse prior information and the collected pulse information to obtain the information of the incorrectly sampled part due to the pulse accumulation in the form of a look-up table, the real-time recovery of the accumulated pulse information is completed. The present invention first uses the multi-voltage threshold sampling method to complete the recognition of the accumulation pulse at a high count rate and the triggering of the pulse signal processing process, and then uses the pulse prior information and the collected pulse information to obtain The information of the sampling part completes the real-time recovery of the accumulation pulse information. The method of the present invention is simple and efficient, and is easy to implement on a real-time data acquisition system at the detector level, and can still achieve better accumulation of pulse information recovery effect under the condition of 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, and then photoelectric conversion devices are used to detect gamma photons. It is converted into a scintillation pulse electrical signal, and finally the information corresponding to the gamma photon contained in the scintillation pulse electrical signal is extracted through a data acquisition circuit. [0003] Counting performance is one of the basic performance indicators of high-energy particle detectors, which reflects the limi...

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 position-sensitive photomultiplier tubes (Photomultiplier Tube, PMT for short) 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 angular pulse signal is triggered independently, resulting in asynchronous triggering time and deteriorating 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

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