Optimization of Timepix3-based conventional Compton camera using electron track algorithm
Optimization of Timepix3-based conventional Compton camera using electron track algorithm
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DOI：
10.1016/j.nima.2021.165954
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发表时间：
2021-05
期刊：
影响因子：
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通讯作者：
Jiaxing Wen;Xutao Zheng;Huai-zhong Gao;M. Zeng;Yuge Zhang;Ming-hai Yu;Yuchi Wu;J. Cang;G. Ma;Zong-qing Zhao
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作者：
Jiaxing Wen;Xutao Zheng;Huai-zhong Gao;M. Zeng;Yuge Zhang;Ming-hai Yu;Yuchi Wu;J. Cang;G. Ma;Zong-qing Zhao
混合像素探测器Timepix 3允许在每个55 μ m像素中同时测量事件的时间和能量沉积，这使得Timepix 3成为紧凑型康普顿相机的一种有前途的方法。然而，基于这种高像素密度探测器的康普顿相机在MeV γ射线源成像时，由于高能康普顿电子或光电子的扩散会触发多个像素，导致相互作用位置的测量不准确，导致角分辨率下降。在这项研究中，电子径迹算法被用来重建电子径迹，并确定相互作用点。实验结果表明，该算法的效果是显著的。基于Timepix 3的单层康普顿相机在对60 Co γ射线源成像时，角分辨率提高到12 °（FWHM）。
The hybrid pixel detector Timepix3 allows the measurement of the time and energy deposition of an event simultaneously in each 55 μ m pixel, which makes Timepix3 a promising approach for a compact Compton camera. However, the angular resolution of Compton camera based on this kind of detector with high pixel density is usually degraded in imaging of MeV gamma-ray sources, because the diffusion of energetic Compton electron or photoelectron could trigger many pixels and lead to an inaccurate measurement of interaction position. In this study, an electron track algorithm is used to reconstruct the electron track and determine the interaction point. An demonstrative experiment was carried out, showing that the effect of this algorithm was significant. The angular resolution measures of a single layer Compton camera based on Timepix3 was enhanced to 12 degrees (FWHM) in imaging of a 60 Co gamma-ray source.