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Single event dead time detecting method and device

A detection method and a single-event technology, applied in the field of medical imaging imaging and processing, can solve the problems of long time and high difficulty of testing

Active Publication Date: 2018-07-17
沈阳智核医疗科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the decay source method is mainly used to determine the dead time of the PET system. This method requires a high-activity radioactive source for long-term measurement, and the test is difficult and takes a long time.

Method used

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  • Single event dead time detecting method and device

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Experimental program
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Effect test

Embodiment 1

[0034] refer to figure 2 As shown, in step S101, a blank scan is performed to obtain the first data after the blank scan, the first data includes the first single-event count rate of the first total spectrum and the first single-event count rate of the energy zone, and the energy zone corresponds to the The region of the all-energy peak that describes the decay of intrinsic radionuclides.

[0035] The first data is the counting data obtained after the PET system performs a scan. This scan is an empty scan. An empty scan refers to a scan performed without placing any radiation source in the field of view of the PET detector. In this way, in the first After the second scan, all the photons generated in the detector are produced by scintillation crystal self-decay.

[0036]After the empty scan, the PET system collects the counting data. From the counting data, the single-event counting rate of the first total spectrum and the first single-event counting rate of the energy regio...

Embodiment 2

[0059] The difference from Embodiment 1 is that there are multiple energy zones used for counting in this embodiment, and the single-event dead time is determined by counting rates of multiple energy zones. The different parts from Embodiment 1 will be described in detail below. The same parts will not be repeated.

[0060] In step S201, the first data after the empty scan is obtained, the first data includes the first single-event count rate of the first total spectrum and the first single-event count rate of a plurality of energy regions, the energy regions correspond to the inherent radionuclide The all-energy peak region of decay.

[0061] In this embodiment, there are multiple energy zones, that is, the single-event count rate of multiple energy zones is obtained. In a specific example, the scintillation crystal of the detector is a LYSO crystal. In this step, after obtaining the empty scan, obtaining the first data includes: the first total spectrum single-event count r...

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Abstract

The embodiment of the invention discloses a single event dead time detecting method and device suitable for a PET system in which a scintillation crystal comprises an intrinsic radionuclide. The method comprises obtaining first data after empty scanning, and then obtaining the second data after radioactive source scanning, wherein the data after the empty scanning is the data corresponding to theintrinsic radionuclide decay, and the energy region of the radioactive source decay is different from the energy region in the first data of the intrinsic radionuclide, thus, the energy region for counting of the intrinsic radionuclide can be distinguished in the data after the radioactive source scanning, so that a count rate corresponding to the intrinsic radionuclide decay after the radioactivesource scanning can be obtained, and the photon count rates generated by the same decay after the two scans are the same. Through the first data and the second data, a single event dead time can be obtained. The method needs fewer acquisition times and shorter time, and the operation is simple, and the utilization efficiency of the PET system is improved.

Description

technical field [0001] The present invention relates to the technical field of medical image imaging and processing, in particular to a single-event dead time detection method and device. Background technique [0002] The Positron Emission Computed Tomography (PET) system is one of the most advanced medical diagnostic imaging equipment at present. It uses nuclides undergoing beta decay, and the positrons generated during the decay are captured by the surrounding electrons. Gamma photons are generated by the annihilation effect, and these photons are counted to realize imaging. [0003] The PET system is composed of multiple subsystems. When processing two consecutive events, each subsystem requires a minimum processing time, which is called dead time. The dead time of the PET system is the minimum processing time required by the detector processing module. Within this minimum processing time, the processing of an annihilation event can be guaranteed to be completed. The lo...

Claims

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Application Information

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IPC IPC(8): G01T1/29A61B6/03
Inventor 常杰刘勺连孙智鹏
Owner 沈阳智核医疗科技有限公司
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