Reconstruction method of fan-shaped NaI (T1) detector array TGS transmission image
A detector array and transmission image technology, applied in image enhancement, image data processing, instruments, etc., can solve problems such as time-consuming and complicated calculation process, and achieve the effects of simplifying steps, improving reconstruction quality, and improving efficiency
Pending Publication Date: 2022-03-01
SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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According to the characteristics of sparse angle data sampling of the fan-shaped detector array TGS device, an iterative image reconstruction algorithm is selected—the iterative algorithm has better performance in solving underdetermined equations and can obtain better quality reconstructed images, but its calculation process is complicated and consumes a lot of energy. duration
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[0232] 1. Set up the system;
[0233] The fan-shaped NaI(Tl) detector array TGS device adopts the scanning method of the rotating nuclear waste barrel to obtain the relevant information of the single-layer nuclear waste barrel to be tested, and uses the principle of sparse signal reconstruction to rotate counterclockwise at a uniform speed with the geometric center of the nuclear waste barrel to be tested as the rotation center , a transmission scanning measurement is performed every 30° rotation angle, and a total of 13 sets of data are measured by rotating 360°.
[0234] In this embodiment, a total of 7 NaI(Tl) detectors are used, arranged in an equiangular (9°) sector with the transmission source as the center, and 7 measured values are measured for each rotation, and finally 13×7=91 Projected measurements. image 3 Schematic diagram for simulated transmission scanning measurement.
[0235] In this embodiment, by comparing the reconstruction value of the linear attenuatio...
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The invention discloses a method for reconstructing a transmission image of a fan-shaped NaI (T1) detector array TGS, which can improve the reconstruction quality of the transmission image. According to the method for reconstructing the transmission image of the fan-shaped NaI (T1) detector array TGS, a split Bregman algorithm and TV noise reduction are integrated into a traditional MLEM iteration process (MLEM-SBTV), a transmission scanning measurement process of a fan-shaped NaI (T1) detector array TGS system is simulated, and line attenuation coefficient distribution image reconstruction is performed on a simulation result. By adopting the method for reconstructing the transmission image of the fan-shaped NaI (T1) detector array TGS, the quality of the reconstructed image can be improved.
Description
technical field [0001] The invention relates to image reconstruction, in particular to a method for reconstructing a TGS transmission image of a fan-shaped NaI(Tl) detector array. Background technique [0002] It is well known that the development of nuclear science and technology is the need for the continuous development of our country's social economy and the continuous improvement of people's living standards. During the application and production of nuclear technology, a large amount of radioactive solid waste is generated, which is usually stored in standard nuclear waste barrels. For solid nuclear waste prepared in steel drums, it is necessary to conduct radioactive detection, screening and classification, and store and dispose of them according to corresponding regulations. Tomographic gamma scanning (TGS), as a non-destructive testing technology, can identify and quantitatively analyze radionuclides in nuclear waste barrels, and reconstruct the activity distributio...
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Login to View More IPC IPC(8): G06T5/00
CPCG06T5/00G06T5/70
Inventor 石睿母湘樊郑洪龙庹先国
Owner SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING