Analysis and simultion. for Compton camera's imaging resolution
文献类型:期刊论文
作者 | Cai Xiao-Hong1,2; Song Zhang-Yong1,2; Yu De-Yang1,2 |
刊名 | ACTA PHYSICA SINICA |
出版日期 | 2019-06-05 |
卷号 | 68期号:11页码:9 |
ISSN号 | 1000-3290 |
关键词 | Compton camera heavy ion therapy Geant 4 simulation back-projection imaging |
DOI | 10.7498/aps.68.20182245 |
通讯作者 | Song Zhang-Yong(songzhy@impcas.ac.cn) ; Cai Xiao-Hong(caixh@impcas.ac.cn) |
英文摘要 | Compared with traditional gamma-ray imaging equipment, the Compton camera is a very promising imaging device in nuclear medicine and molecular imaging, and has a strong potential application in monitoring beams in heavy-ion-therapy because of its high efficiency feature. A demonstration device for heavy ion cancer treatment with complete intellectual property right has been built at Institute of Modern Physics, Chinese Academy of Sciences in Wuwei city of Gansu Province. At present the device is being up-graded, and the heavy ion cancer treatment is being generalized in national wide. In view of the broad prospects of heavy ion cancer treatment, the imaging resolution of Compton camera is analyzed theoretically, and three errors effecting the imaging resolution, which are energy resolution, position resolution of detector and the Doppler effect, are determined. Then the three errors are simulated by using the Geant 4 packages. The physical process in simulation is selected as the G4EMPenelopePhysics model, which makes the atomic shell cross section data for low energy physical process used directly. The Compton camera geometry consists of two layers of detectors. The layer close to gamma source is called detector and the other one is called absorption detector. The material of scatter detector is selected as low-Z silicon and carbon, and the absorb detector is high-Z germanium. The thickness value of scatter detector and absorb detector are both 20 mm. The spacing between the two layers is 100 mm. The simulation results by Geant 4 are used to reconstruct the image of point-like gamma source through using the back-projection algorithm. The simulation results and the re-constructed images indicate that the difference between the image full width at half maximum induced by 2 mm position resolution and that induced by 5.0% relative energy resolution of scatter detector is about 10%, and amount to that by the Doppler effect of Silicon. For the gamma ray with energies of several hundred keV, the energy resolution of Si detectors is easily better than 1.0% in practice. Therefore, the detector's position resolution dominates the image quality of the Compton camera. Considering the Doppler effect, manufacturing techniques and imaging efficiency, 2.0 mm-sized crystal unit and 1.0% energy resolution power is suggested for practically manufacturing the Compton camera. |
WOS关键词 | BEAM |
资助项目 | National Natural Science Foundation of China[11675279] ; Program of Light of the West, China |
WOS研究方向 | Physics |
语种 | 英语 |
出版者 | CHINESE PHYSICAL SOC |
WOS记录号 | WOS:000470261500033 |
资助机构 | National Natural Science Foundation of China ; Program of Light of the West, China |
源URL | [http://119.78.100.186/handle/113462/133412] |
专题 | 中国科学院近代物理研究所 |
通讯作者 | Cai Xiao-Hong; Song Zhang-Yong |
作者单位 | 1.Univ Chinese Acad Sci, Sch Nucl Sci & Technol, Beijing 100049, Peoples R China 2.Chinese Acad Sci, Inst Modern Phys, Lanzhou 730000, Gansu, Peoples R China |
推荐引用方式 GB/T 7714 | Cai Xiao-Hong,Song Zhang-Yong,Yu De-Yang. Analysis and simultion. for Compton camera's imaging resolution[J]. ACTA PHYSICA SINICA,2019,68(11):9. |
APA | Cai Xiao-Hong,Song Zhang-Yong,&Yu De-Yang.(2019).Analysis and simultion. for Compton camera's imaging resolution.ACTA PHYSICA SINICA,68(11),9. |
MLA | Cai Xiao-Hong,et al."Analysis and simultion. for Compton camera's imaging resolution".ACTA PHYSICA SINICA 68.11(2019):9. |
入库方式: OAI收割
来源:近代物理研究所
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