Method for reconstructing positron emission computed tomography images
A technology of positron emission and tomography, applied in the field of imaging, to achieve the effect of solving the problem of incomplete data sampling, improving use efficiency, and reducing manufacturing and maintenance costs
Active Publication Date: 2016-03-02
INST OF HIGH ENERGY PHYSICS CHINESE ACAD OF SCI
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[0010] The purpose of the present invention is to provide a method for reconstructing positron emission computed tomography images, to solve the problems of relatively large limitations in the prior art
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[0036] The present invention will be described in further detail below in conjunction with the accompanying drawings.
[0037] Figure 5 A flow chart of a method for reconstructing a PET image according to the present invention is shown. As shown in the figure, it includes four steps S1-S4, which are sequentially described as follows.
[0038] Step S1: According to the working principle of the scattered photon event projection of Compton scattering, create a scattered photon event projection probability model described by the specified model parameters.
[0039] In this step S1, the scattered photon events include two-photon single-scattering events and single-photon single-scattering events. Two-photon single-scattering event is the scattered photon event detected by the detector after the two gamma photons in the back-to-back gamma-photon pair interact with the object to be detected and undergo Compton scattering, that is, two-photon single-scattering occurs Back-to-back g...
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The invention provides a method for rebuilding an image of positron emission tomography. The method includes that a probability model of scattering photon example projection described by appointed model parameters is established according to the operating principle of scattering photon example projection of Compton scattering; a spread function of scattering photon example dot is established according to the probability model of scattering photon example projection; a spread function of non-scattering photon example dot is established according to the probability model of scattering photon example projection and the spread function of scattering photon example dot; and by means of iterative reconstruction algorithm, a PET (positron emission tomography) image is rebuilt by scattering photon example and non-scattering photon example according to the spread function of scattering photon example dot and the spread function of non-scattering photon example dot. According to the method, detection efficiency can be improved, in clinical application, the radiation dosage bore by a detected object and an operator is substantially reduced, detection time is shortened, using efficiency is improved, data sampling is perfected, detector structure is simplified, and cost of the detector is reduced.
Description
technical field [0001] The invention relates to an imaging method, in particular to a method for reconstructing a positron emission computed tomography image. Background technique [0002] Positron Emission Computed Tomography (PET), as a nuclear medical imaging technology, provides important information for the diagnosis of major diseases, observation of prognosis and research and development of new drugs, and has important value in clinical application and biomedical research . The main principle is: inject the drug (tracer) labeled with the positron nuclide into the body of the detected object, when the positron nuclide on the tracer decays, it emits positrons, and the positrons annihilate with the electrons in the body The reaction produces two gamma photons (back-to-back gamma photon pairs) in opposite directions with an energy of 511keV, which are detected by detectors placed around the object under test. An annihilation reaction is called an instance, such as figur...
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IPC IPC(8): G06T11/00
Inventor 贠明凯王璐曹学香张玉包孙翠丽刘双全高娟武丽伟周小林王海鹏樊馨李道武章志明单保慈魏龙
Owner INST OF HIGH ENERGY PHYSICS CHINESE ACAD OF SCI