Coincidence event screening method and apparatus for full-digital PET

Abstract

The invention is suitable for the technical field of medical treatment and provides a coincidence event screening method and apparatus for full-digital PET. The method comprises the steps of calculating energy information of events, and sorting the events according to time; performing position and time coincidence judgment on the ith and jth events, and performing energy screening on two paired events with position and time coincidence according to the energy information of the events; when the energy screening of any of the two paired events with the position and time coincidence is not met,re-determining i and j, and performing the position and time coincidence judgment on the ith and jth events; and when the energy screening of the two paired events with the position and time coincidence is met, marking coincidence information of the two paired events. The coincidence events of the full-digital PET are screened by adopting software; threshold data subjected to coincidence screeningcalculation can be adjusted according to demands or different test conditions; and feedback optimization can be performed according to a result in a specific test process.

Description

technical field [0001] The invention belongs to the field of medical technology, and in particular relates to a method and device for screening coincident events of all-digital PET. Background technique [0002] Positron Emission Tomography (PET) system is an advanced molecular imaging diagnostic equipment in today's medical field. Because it uses radionuclides as tracers, it is also called nuclear medicine equipment. The PET system is currently widely used in the detection of early tumor lesions, the evaluation of the recovery effect of radiotherapy and chemotherapy, and the examination of diseases in the heart, brain and nerve systems, and has irreplaceable advantages in some diagnostic fields. [0003] In principle, PET injects the FDG label containing positron nuclides as a tracer into the subject, and the tracer will diffuse into various tissues along with the blood and participate in the metabolic activities of the human body, and the positron nuclide will be released....

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Problems solved by technology

[0004] In the prior art, the screening or determination of PET compliance events is based on traditional PET, such as "a hardware-based compliance event determination method" (authorized announcement number: CN103336683B), "determining random compliance events and determining true compliance events In the technical schemes disclosed in the Chinese invention patents of "method and device" (authorized announcement number: CN103559391B) and "a method and device for judging conforming events" (authorized announcement number: 103413051B), simulation or analog-digital hybrids are used Or the analog-digital hybrid method is used to process high-speed scintillation pulses, and the time information or position information of the detected photons cannot be obtained directly. The γ-photon pairs respectively arrive at the spatial positions of the detection device to form a line of coincidence, and the length of the line of coincidence is used to determine whether the position of the γ-photon pair is consistent. The process of determining ...

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