Photon measurement front-end circuit

Abstract

The invention provides a photon measurement front-end circuit which comprises the components of one or a plurality of signal processing circuits which are in one-to-one correspondence with one or a plurality of sensor element sets, and a main processing circuit. Each signal processing circuit in the one or the plurality of signal processing circuits comprises the components of one or a plurality of front-end processing circuits which are in one-to-one correspondence with one or a plurality of sensor elements in a corresponding sensor element set, and a back-end processing circuit. The front-end processing circuit is used for receiving an initial current signal from a corresponding sensor element and outputting a pulse current signal when the amplitude of the initial current signal is larger than a current threshold. The back-end processing circuit is used for processing each pulse current signal from one or the plurality of front-end processing circuits for generating an output signal. The main processing circuit is used for measuring the photons which are detected by the one or the plurality of sensor element sets according to the output signal of each back-end processing circuit in the one or the plurality of signal processing circuits. The photon measurement front-end circuit has advantages of simple structure and easy expansion to an array.

Description

technical field [0001] The invention relates to the field of circuits, in particular to a photon measurement front-end circuit. Background technique [0002] The front-end detection device of a high-energy photon (X-ray, gamma photon, etc.) measurement system generally includes three parts: a scintillation crystal, a photodetector (or photoelectric sensor) and a photon measurement front-end circuit. The interaction of high-energy photons with the scintillation crystal produces a group of lower-energy visible photons. The photoelectric sensor converts the light signal carried by the visible photon group into an electrical signal. The main purpose of the photon measurement front-end circuit is to obtain the energy and arrival time of high-energy photons by measuring the electrical signal generated by the photoelectric sensor. For example, in positron emission tomography (PET) and single photon emission tomography (SPECT) systems, gamma photons interact with scintillation cry...

AI Technical Summary

Problems solved by technology

The main disadvantage of this method is that it requires a subsequent digital circuit to read out the digitized energy and time signals, and the interface between the photon measurement front-end circuit and the subsequent digital circuit is relatively complicated, for example, it may use a Universal Serial Bus (USB) interface to implement

Therefore, when the photon measurement front-end circuit is expanded into an array, the circuit structure is more complicated and difficult to realize

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