Method for acquiring geometric correction parameter of PET (positron emission tomography) system
A geometric correction and parameter technology, applied in the field of obtaining PET system geometric correction parameters, can solve the problems of inflexibility, complicated operation process, economic cost, time and manpower consumption, etc., to ensure accuracy, speed up design, and simple process Effect
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[0028] Example one
[0029] This embodiment provides a method for obtaining the geometric correction parameters of the PET system. The method is based on computer simulation. A virtual PET system identical to the actual PET system is constructed through software. In the virtual PET system, a specially designed virtual test object is performed. After scanning, the relevant event data is obtained, and then the difference is compared and analyzed to obtain the geometric correction parameters.
[0030] The process of the method for obtaining the geometric correction parameters of the PET system is as follows figure 1 As shown, including the following steps:
[0031] Step 102: Construct a virtual PET system environment by writing a set of computer software based on Monte Carlo simulation technology. The principle of Monte Carlo simulation technology is well known, and its accuracy and reliability have also been confirmed by many scientific research documents. The computer software writt...
Example Embodiment
[0041] Example two
[0042] The difference between this embodiment and the first embodiment is that in step 102, a virtual PET system environment, such as GATE (Geant4 Application for Tomographic Emission), is constructed through open source computer software.
Example Embodiment
[0043] Example three
[0044] This embodiment verifies the effect of the method for obtaining the geometric correction parameters of the PET system described in the first embodiment, and the verification process is as follows:
[0045] In an actual PET system, the uniform cylinder is scanned first to obtain the measured coincidence event data; then the image is reconstructed based on the measured coincidence event data, and the PET image of the measured uniform cylinder can be obtained. The gray value in the figure represents the intensity of radioactivity. The larger the area gray value (the image is white and bright), the stronger the radioactive intensity of the area; the smaller the area gray value (the dark image), the weaker the radioactive intensity of the area. Theoretically, the gray value of the cross-sectional image of a uniform cylinder PET image is almost equal in a circular area. In other words, the brightness of a circular area in the cross-sectional view is unifor...
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