Evaluation of double photon coincidence Compton imaging method with GEANT4 simulation
Evaluation of double photon coincidence Compton imaging method with GEANT4 simulation
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利用GEANT4模拟评估双光子符合康普顿成像方法
DOI：
10.1016/j.nima.2017.05.039
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
H.
中科院分区：
文献类型：
--
作者：
Yoshihara;Y.;Shimazoe;K.;Mizumachi;Y.;& Takahashi;H.
康普顿成像已被用于各种应用，包括天文观测、放射性废物管理和生物医学成像。放射性同位素的位置是通过大量的事件在多个锥形道的交叉点上确定的，这降低了图像的信噪比。我们发展了一种先进的康普顿成像方法，即双光子符合康普顿成像方法，它利用两个伽马射线同时引起的康普顿散射相互作用的信息来定位高信噪比的放射性同位素。这种成像方法的靶向放射性同位素是同时发射几种伽马射线的特定核素，如60Co、134Cs和111In等。由于它们的位置是在两个康普顿锥体的交点上确定的，因此大部分锥体踪迹将在三维空间中消失，从而提高了信噪比和角分辨率。本文利用GEANT4蒙特卡罗模拟对双光子符合康普顿成像法和单光子康普顿成像法进行了比较。
Compton imaging has been used for various applications including astronomical observations, radioactive waste management, and biomedical imaging. The positions of radioisotopes are determined in the intersections of multiple cone traces through a large number of events, which reduces signal to noise ratio (SNR) of the images. We have developed an advanced Compton imaging method to localize radioisotopes with high SNR by using information of the interactions of Compton scattering caused by two gamma rays at the same time, as the double photon coincidence Compton imaging method. The targeted radioisotopes of this imaging method are specific nuclides that emit several gamma rays at the same time such as60Co,134Cs, and111In, etc. Since their locations are determined in the intersections of two Compton cones, the most of cone traces would disappear in the three-dimensional space, which enhances the SNR and angular resolution. In this paper, the comparison of the double photon coincidence Compton imaging method and the single photon Compton imaging method was conducted by using GEANT4 Monte Carlo simulation.