Positron emission tomography electronic signal processing system and method

Abstract

The invention provides a positron emission tomography electronic signal processing system and method. The positron emission tomography electronic signal processing system and method are used for receiving gamma photons and obtaining the position information and energy information of the gamma photons. The method includes the steps that a summation circuit carries out summation on input voltage signals, obtains amplified voltage signals and outputs the amplified voltage signals to a constant current source charging and discharging circuit; the constant current source charging and discharging circuit converts the amplified voltage signals into discharging voltage signals and outputs the discharging voltage signals to a high-speed comparator; the high-speed comparator compares the discharging voltage signals with a preset threshold voltage, generates square signals and outputs the square signals to a logic calculation module; the logic calculation module works out the position information and energy information of the gamma photons according to the square signals. The positron emission tomography electronic signal processing system and method amplify the signals through the summation circuit and reduce the number of signal passages, replace a complex ADC sampling circuit with the constant current source charging and discharging circuit and the high-speed comparator, simplify a PET electronic signal processing circuit and are favorable for realizing miniaturization of PET equipment.

Description

technical field [0001] The invention relates to the technical field of nuclear medicine imaging, in particular to a signal processing system and method for positron emission tomography electronics. Background technique [0002] Positron emission tomography (PET, hereinafter referred to as PET) is an important tomographic imaging technique and equipment in the field of nuclear medicine, and has been widely used in diagnosis and research in the medical field. Its main principle is to inject a nuclide that can emit positrons as a specific tracer into the patient, and the positrons emitted by the tracer annihilate with the electrons in the human body to generate a pair of gamma photons, which are detected by the detector. After handing it over to the electronic credit system for further processing, and then sending it to the computer for image reconstruction, the distribution of the tracer in the patient's body can be obtained, so as to realize early detection and localization o...

AI Technical Summary

Problems solved by technology

[0009] Due to the different targets of the PET imaging system, the analog signals output by the detector range from dozens to hundreds of channels, and each channel needs to be processed electronically. Therefore, when using the signal processing scheme of ADC sampling A large number of ADC conversion circuits and their front-end drive circuits are required, which increases the complexity of the circuit and is not conducive to the miniaturization of PET equipment

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