Positron emission tomography scanner and coincidence judging and selecting method therein

Abstract

The invention relates to a positron emission tomography scanner and a coincidence judging and selecting method therein. The positron emission tomography scanner comprises a detecting ring, wherein the detecting ring consists of a plurality of detectors. The coincidence judging and selecting method comprises the following steps of: judging whether each detector is correlated to opposite detectors, acquiring correlation data according to each judgment result, and judging the two detectors to be correlated to each other if a time difference of a single event respectively detected by the two detectors stays within a coincidence time window, wherein the opposite detectors of any detector refer to the detectors in a sector area with a preset angle by adopting the detector as a center; and judging whether the two detectors are exclusively correlated to each other according to the correlation data and judging the single event detected by the two exclusively-correlated detectors to be a coincidence event. The positron emission tomography scanner and the coincidence judging and selecting method have advantages of rapidness in coincidence judging and selection, high efficiency and wide application range.

Description

technical field [0001] The invention relates to the field of nuclear medicine imaging, in particular to a Positron Emission Tomography (PET) scanner and a coincidence judging method therein. Background technique [0002] The purpose of PET is to image and determine the position of the emitting positron nuclide, so as to obtain the distribution of tracer drugs in the body and achieve the purpose of diagnosing diseases such as tumors. However, PET does not directly detect positrons, but reflects the position of positron nuclides by detecting 511KeV gamma photon pairs generated by electron pair annihilation. The connection line between the two detector crystal strips that received the two gamma photons is called the line of response (Line of Response, LOR), which represents the straight line where the gamma photon pair flying in the opposite direction is located, and the position of the annihilation event is at on this straight line. The method of using the connection line be...

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Problems solved by technology

But the disadvantages are: when the amount of data involved in matching is large at the same time, it becomes difficult to sort in the field-programmable gate array (Field-Programmable Gate Array, FPGA), consumes a lot of resources, takes a long clock cycle, and is difficult to implement in practice. Implemented in engineering applications

Therefore, this method is feasible when there are few front-end detector modules such as small animal PET or mammary gland PET, and there are few matching data at the same time. However, in human PET, the detector modules are multiplied, and the above method is not feasible.

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