Image reconstruction algorithm for a spinning strip CZT SPECT camera with a parallel slat collimator and small pixels.
Image reconstruction algorithm for a spinning strip CZT SPECT camera with a parallel slat collimator and small pixels.
复制标题
具有平行板条准直器和小像素的旋转条 CZT SPECT 相机的图像重建算法。
DOI：
10.1118/1.1813873
复制
发表时间：
2004
期刊：
影响因子：
3.8
通讯作者：
Gagnon,Daniel
中科院分区：
文献类型：
--
作者：
Zeng,GengshengL;Gagnon,Daniel
本文讨论了使用小像素的自旋CdZnTe单光子发射计算机断层扫描（SPECT）相机，安装了平行板条准直器。在传统的板条准直配置中，在两个相邻的准直器板条之间存在探测器像素。在我们的设计中，像素大小减半。也就是说，在准直器保持不变的同时，存在两个较小的像素来替换两个相邻板条之间的常规像素。它比我们使用倾斜板条的旧设计有优势。为了采集完整的数据集，倾斜板条准直器必须在每个SPECT视图处旋转360°，而所提出的设计在每个SPECT视图处仅需要180°。已经进行了计算机模拟和体模实验来研究小像素配置的性能。据观察，这种设计有可能增加探测器的空间分辨率，同时保持光子计数相同。
This paper discusses the use of small pixels in a spinning CdZnTe single photon emission computed tomography (SPECT) camera that is mounted with a parallel slat collimator. In a conventional slat collimation configuration, there is a detector pixel between two adjacent collimator slats. In our design, the pixel size is halved. That is, there are two smaller pixels to replace a regular pixel between two adjacent slats while the collimator remains unchanged. It has an advantage over our older design that uses tilted slats. In order to acquire a complete data set the tilted‐slat collimator must spin 360° at each SPECT view while the proposed design requires only 180° at each SPECT view. Computer simulations and phantom experiments have been carried out to investigate the performance of the small‐pixel configuration. It is observed that this design has the potential to increase the spatial resolution of the detector while keeping photon counts the same.