Fully Three-dimensional Reconstruction For A Pet Camera With Retractable Septa
Fully Three-dimensional Reconstruction For A Pet Camera With Retractable Septa
复制标题
带伸缩隔片的宠物相机全三维重建
DOI：
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发表时间：
1990
期刊：
影响因子：
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通讯作者：
T. Jones
中科院分区：
文献类型：
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作者：
D. Townsend;A. Geissbuhler;M. Defrise;E. Hoffman;T. Spinks;D. Bailey;M. Gilardi;T. Jones
一个完全的3-D重建算法已被开发，以重建数据从16环PET相机（西门子/CTI 953 B）与自动伸缩隔。断层扫描仪能够采集任何一对探测器环之间的重合，并且对于均匀的20 cm直径圆柱体，隔膜缩回使总系统计数率增加7.8倍（包括散射）和4.7倍（减去散射）。重建算法基于3-D滤波反投影，以适合于多角度正弦图数据的形式表示。由于断层摄影机的截短圆柱形几何形状而未测量但空间不变响应函数所需的正弦图通过前向投影获得。滤波后，使用体素驱动程序将完整的正弦图集反投影到128 x128 x31体素的3-D体积中。该算法已通过模拟验证，并使用953 B的体模和临床数据进行了测试。
A fully 3-D reconstruction algorithm has been developed to reconstruct data from a 16 ring PET camera (a Siemens/CTI 953B) with automatically retractable septa. The tomograph is able to acquire coincidences between any pair of detector rings and septa retraction increases the total system count rate by a factor of 7.8 (including scatter) and 4.7 (scatter subtracted) for a uniform, 20 cm diameter cylinder. The reconstruction algorithm is based on 3-D filtered backprojection, expressed in a form suitable for the multi-angle sinogram data. Sinograms which are not measured due to the truncated cylindrical geometry of the tomograph, but which are required for a spatially invariant response function, are obtained by forward projection. After filtering, the complete set of sinograms is backprojected into a 3-D volume of 128x128x31 voxels using a voxel-driven procedure. The algorithm has been validated with simulation, and tested with both phantom and clinical data from the 953B.