Positron emission tomography scanner and conformity judgment and selection method

Abstract

The invention relates to a positron emission tomography scanner and a conformity judgment and selection method. The scanner comprises a plurality of detectors. The method comprises the following steps: acquiring instance information of each detector; storing the instance information in the corresponding storage space; taking the time information of each instance information as address information of the storage space; acquiring a plurality of sign information according to each instance information, wherein each sign information shows times of detecting gamma photons in corresponding time; acquiring judgment and selection information according to each sign information, wherein the judgment and selection information represents the times of detecting the gamma photons in a preset conformed time window from the corresponding time information; ranking each judgment and selection according to the corresponding time information; checking the ranked judgment and selection information by utilizing sequence checking features in sequence; identifying the storage space that the conformed instance corresponds to; and outputting the instance information in the storage space that the conformed instance corresponds to. The positron emission tomography scanner and the conformity judgment and selection method provided by the invention have the advantages of rapid and efficient conformity judgment and selection 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. Imple

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