Double-Layered CZT Compton Imager
Double-Layered CZT Compton Imager
复制标题
双层 CZT 康普顿成像仪
DOI：
--
复制
发表时间：
2017
影响因子：
1.8
通讯作者：
Wonho Lee
中科院分区：
文献类型：
--
作者：
Younghak Kim;Taewoong Lee;Wonho Lee
在本文中，我们提出了一个双层碲锌镉康普顿相机使用加权列表模式最大似然期望最大化（MLEM）方法。我们对性能进行了蒙特卡罗模拟。检测系统包括两个平行布置的检测器阵列。每个阵列由像素间距为7.5 mm的<inline-formula><tex-math notation="LaTeX">6 × 6</tex-math></inline-formula>晶体组成。单晶的尺寸为<inline-formula><tex-math notation="LaTeX">6 × 6 × 15</tex-math></inline-formula>mm。对于康普顿成像，<sup>137</sup>Cs活度设置为78 kBq，采集时间设置为2小时。通过加权MLEM方法，小角度不确定度的事件比大角度不确定度的事件更受重视。根据每个事件的能量和几何不确定性计算每个角度不确定性。我们比较了传统的列表模式MLEM和加权的列表模式MLEM单，双探测器阵列。结果表明，与其他组合相比，双层成像器与加权MLEM方法的组合代表了最佳的图像性能。在偏移位置处的源也被模拟以估计相机系统的方向依赖性。
In this paper, we propose a double-layered cadmium zinc telluride Compton camera using the weighted list-mode maximum likelihood expectation maximization (MLEM) method. We performed a Monte Carlo simulation of the performance. The detection system comprised two detector arrays arranged in parallel. Each array consisted of <inline-formula> <tex-math notation="LaTeX">$6 \times 6$ </tex-math></inline-formula> crystals with a 7.5 mm pixel pitch. The dimension of a single crystal was <inline-formula> <tex-math notation="LaTeX">$6 \times 6 \times 15$ </tex-math></inline-formula> mm. For Compton imaging, the <sup>137</sup>Cs activity was set to 78 kBq and the acquisition time was set to 2 hours. By applying the weighted MLEM method, the events with small angular uncertainty were more emphasized than those with large angular uncertainty. Each angular uncertainty was calculated based on the energy and geometry uncertainties of each event. We compared the traditional list-mode MLEM and the weighted list-mode MLEM for single and double detector arrays. The results showed that the combination of a double-layered imager with the weighted MLEM method represented the best image performance compared to other combinations. The sources at the offset positions were also simulated to estimate the directional dependency of the camera system.
影响因子：
3.8
作者：
M. Singh
通讯作者：
M. Singh
DOI：
10.1364/josaa.14.002914
发表时间：
1997-11-01
影响因子：
1.9
作者：
Barrett, HH;White, T;Parra, LC
通讯作者：
Parra, LC