Effect of detector scatter on the decoding accuracy of a DOI detector module
Effect of detector scatter on the decoding accuracy of a DOI detector module
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DOI：
10.1109/nssmic.1999.845812
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发表时间：
1999-10
期刊：
影响因子：
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通讯作者：
R. Miyaoka;T. Lewellen
中科院分区：
文献类型：
--
作者：
R. Miyaoka;T. Lewellen
采用蒙特卡罗模拟方法研究了探测器散射对DOI探测器模块解码精度和DOI探测器系统定量成像特性的影响。探测器模块由4/spl × 4探测器单元阵列组成。每个单元由2/spl倍/2块2/spl倍/2/spl倍/20毫米LSO晶体组成。探测器单元使用光共享和比例信息来估计DOI。探测器系统由24个探测器模块组成。研究了利用不同标准选择探测器模块中第一交互点以提高解码精度的定位方法（如能量最大值、第二最大值、最小DOI）。选择与DOI最小对应的探测器单元，对垂直于探测器进入的光子提供了最佳的解码精度。然而，对于以大入射角（例如，30度）进入的光子，最大能量选择准则表现最好。由于探测器单元内散射造成的DOI平均偏移量为1.7 mm。探测器散射不影响模拟DOI探测器系统的图像分辨率；然而，它确实影响了感兴趣的小区域的定量恢复。
Monte Carlo simulation was used to study the effect detector scatter has on the decoding accuracy of a depth of interaction (DOI) detector module and on the quantitative imaging characteristics of a DOI detector system, The detector module consisted of a 4/spl times/4 array of detector units. Each unit consisted of a 2/spl times/2 block of 2/spl times/2/spl times/20 mm LSO crystals. The detector units use light sharing and ratio information to estimate DOI. The detector system consisted of 24 detector modules. Positioning methods using different criteria to select the first interaction point in a detector module to improve decoding accuracy were investigated (e.g., maximum energy, second maximum, minimum DOI). Selecting the detector unit corresponding to the minimum DOI provided the best decoding accuracy for photons entering perpendicular to the detector. However, for photons entering at large angles of incidence (e.g., 30 degrees) the maximum energy selection criterion performed the best. The average DOI offset due to scatter within a detector unit was 1.7 mm. Detector scatter did not affect the image resolution of the simulated DOI detector system; however, it did affect quantitative recovery of small regions of interest.