A detector signal readout circuit, detector and signal processing method

Abstract

The invention discloses a detector signal readout circuit, a detector and a signal processing method. Cathode signal output ends of each row of SiPM (Silicon Photomultipliers) pixels of an SiPM arrayare connected to form M row common connection ends, anode signal output ends of each column of the SiPM pixels are connected to form N column common connection ends, each row common connection end andeach column common connection end are connected with a signal readout circuit, in the case that the SiPM array is in a Geiger mode, the signal readout circuit can filter out alternating current signals of each row and each column, the M-row signal readout circuit can carry out weighted summation on the M-row cathode alternating current signals to obtain two row signals, the N-column signal readout circuit can carry out weighted summation on the N-column anode alternating current signals to obtain two column signals. According to the circuit, the detector and the method in the invention, setting of weight coefficients of the sub-circuits in the rows and columns enables the coordinate precision of the position of a scintillation crystal obtained through a gravity center method based on therow and column signals higher, also, large numbers of shunting resistors and analog amplifiers are not needed, so that the electronics complexity of the circuit and the area of the readout board are reduced.

Description

technical field [0001] The invention relates to the technical field of photoelectric detection, in particular to a detector signal readout circuit, a detector and a signal processing method. Background technique [0002] Silicon photomultiplier (SiPM, Silicon Photomultipliers) is a commonly used photodetector in recent years, which is used in nuclear medicine positron emission tomography (Positron Emission Tomography, PET) and nuclear physics research. [0003] The current PET detector research hotspot is a high-performance position-sensitive detector, which is usually composed of a SiPM array, a signal readout circuit and a scintillation crystal array. The principle of the position-sensitive detector is to determine the specific position of the crystal through the center of gravity of the scintillation light distributed in the SiPM array in the scintillation crystal. Since the number of channels of SiPM arrays is usually large, the use of a separate readout method will res...

AI Technical Summary

Problems solved by technology

Since the number of channels of SiPM arrays is usually large, the use of a separate readout method will cause high electronic complexity and cost. At present, signal readout methods based on SiPM arrays mainly include two types: discrete positioning method and charge distribution method.

The two methods have their own advantages and disadvantages: the charge distribution method has better time performance and positioning accuracy, but its electronic complexity is still high; the electronic complexity of the discrete positioning method is very low, but its time performance is poor, and the positioning The accuracy is also slightly worse than the charge distribution method

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