Positive electron nuclide real-time counting detector based on coincidence detection principle

Abstract

The invention relates to a positive electron nuclide real-time counting detector based on a coincidence detection principle. The detector comprises a face cover internally provided with a plurality ofLYSO crystal probes for catching gamma photons, a conditioning circuit connected with all the LYSO crystal probes and used for amplifying and filtering pulse signals generated when the LYSO crystal probes catch the gamma photons, a pulse signal recording device connected with the conditioning circuit and used for recording count pulses of the gamma photons in the form of timestamps and sending the pulse signals obtained based on all the LYSO crystal probes through different counting channels, a coincidence detection circuit connected with the pulse signal recording device and used for receiving the pulse signals through a plurality of counting channels and recognizing the detected gamma photons through the time coupling of all the counting channels. Compared with the prior art, by arranging the conditioning circuit, the pulse signal recording device and the coincidence detection circuit, the gamma photons can be effectively detected, and therefore positive electron nuclides are detected.

Description

technical field [0001] The invention relates to a medical device, in particular to a positron nuclide real-time counting detector based on the principle of coincident detection. Background technique [0002] Positron-type radionuclides (such as 11 C. 13 N. 18 F, etc.) After labeling biologically active substances, the physiological and biochemical processes of the body are hardly changed. Therefore, clinically, in order to detect the metabolism of human tissues, substances necessary for the metabolism of biological life, such as glucose, protein, nucleic acid, etc., are usually marked with short-lived radionuclides. The accumulation of substances in metabolism reflects the metabolic activities of life, so that the purpose of diagnosis can be achieved without affecting the physiological conditions of the internal environment balance. After physical attenuation and biological metabolism, the positron nuclides used for labeling remain in the subject for a short time, and mo...

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Problems solved by technology

However, the device detects metabolism through images, has a complex structure, large volume, and is expensive. It is mostly used in large hospitals and is not easy to popularize.

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