An elongated position sensitive block detector design using the PMT quadrant sharing configuration and asymmetric light partition
An elongated position sensitive block detector design using the PMT quadrant sharing configuration and asymmetric light partition
复制标题
使用 PMT 象限共享配置和不对称光分区的细长位置敏感块探测器设计
DOI：
10.1109/nssmic.1998.774375
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发表时间：
1998
期刊：
影响因子：
--
通讯作者：
N. Zhang
中科院分区：
文献类型：
--
作者：
W. Wong;S. Yokoyama;J. Uribe;H. Baghaei;Hongdi Li;Junming Wang;N. Zhang
尽管用于位置灵敏探测器模块的光电倍增管象限共享设计对于降低高分辨率正电子发射断层扫描（PET）相机的成本非常有效，但模块阵列边缘处光电倍增管的部分灵敏窗口仍未得到利用。现已开发出一种细长的、非对称偏移的位置灵敏探测器模块，以利用光电倍增管窗口的这一未使用区域。该模块设计采用非对称光分隔，以实现均匀分布的二维位置解码图。该模块被划分为7×8个单元。在本研究中，每个探测器单元的尺寸为2.66×3.05毫米，深度为18毫米。这种探测器设计适用于任何采用光电倍增管象限共享探测器设计的相机，例如在MD安德森癌症中心开发的可变视野原型PET相机（MDAPET）以及西门子/CTI的硅酸镥（LSO）相机。探测器设计中纳入的第二项改进是用涂漆掩模取代探测器模块中的锯切凹槽。将当前模块设计应用于临床高分辨率相机可扩大轴向视野，与本研究中使用的无间隙模块设计相结合时，在三维数据采集中可使相机的符合探测效率提高约2.9倍。
Although the photomultiplier-quadrant-sharing design for position sensitive detector blocks is very effective for reducing the cost of a high resolution PET camera, a section of the photomultiplier's sensitive windows at the edge of the block array remains unused. An elongated, asymmetrically offset position-sensitive detector block has been developed to utilize this unused area of the PMTs window. The block design employs asymmetric light partitions to achieve an evenly distributed two-dimensional position-decoding map. The block is divided into 7/spl times/8 elements. For this study, the dimensions of each detector element are 2.66/spl times/3.05 mm with a depth of 18 mm. This detector design is applicable to any camera using the PMT quadrant-sharing detector design, such as the Variable Field Prototype PET Camera developed at M. D. Anderson Cancer Center (MDAPET) and the Siemens/CTI LSO cameras. A second improvement incorporated into the detector design is the replacement of the saw-cut grooves in the detector blocks by painted masks. The application of the present block design to a clinical high resolution camera expands the axial field-of-view, which, when combines with the gapless block design used in this study, increases the coincidence detection efficiency of the camera by factor of about 2.9 in 3-D data acquisition.