Compton Scattering in Clinical PET/CT With High Resolution Half Ring PET Insert Device.
Compton Scattering in Clinical PET/CT With High Resolution Half Ring PET Insert Device.
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DOI：
10.1109/tns.2010.2046754
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发表时间：
2010
影响因子：
1.8
通讯作者：
Tai YC
中科院分区：
文献类型：
--
作者：
Komarov SA;Wu H;Keesing DB;O'Sullivan JA;Tai YC
将高分辨率PET插入物集成到常规PET系统中可以在减小的成像视场内显著提高其图像的分辨率和对比度。对于扫描仪成像视场的其余部分，插入物是高度衰减和散射的介质。为了使用所有可用的符合事件（包括原始扫描仪中的2个探测器之间的符合，即扫描仪-扫描仪符合），必须实施适当的散射和衰减校正。在这项工作中，我们进行了一系列的蒙特卡罗模拟，估计散射背景的组成和散射校正的重要性。我们实施和测试的单散射模拟（SSS）算法的一个假设的系统，并显示出良好的协议之间的估计散射使用SSS和蒙特卡洛模拟散射贡献。我们进一步应用SSS来估计来自用于临床PET/CT扫描仪的现有原型PET插入件的散射贡献。结果证明，即使在成像视野中存在高分辨率半环PET插入器械时，SSS也适用于估计临床PET/CT系统内的散射贡献。
The integration of a high resolution PET insert into a conventional PET system can significantly improve the resolution and the contrast of its images within a reduced imaging field of view. For the rest of the scanner imaging field of view, the insert is a highly attenuating and scattering media. In order to use all available coincidence events (including coincidences between 2 detectors in the original scanner, namely the scanner-scanner coincidences), appropriate scatter and attenuation corrections have to be implemented. In this work, we conducted a series of Monte Carlo simulations to estimate the composition of the scattering background and the importance of the scatter correction. We implemented and tested the Single Scatter Simulation (SSS) algorithm for a hypothetical system and show good agreement between the estimated scatter using SSS and Monte Carlo simulated scatter contribution. We further applied the SSS to estimate scatter contribution from an existing prototype PET insert for a clinical PET/CT scanner. The results demonstrated the applicability of SSS to estimate the scatter contribution within a clinical PET/CT system even when there is a high resolution half ring PET insert device in its imaging field of view.