Influence of Rotation Increments on Imaging Performance for a Rotatory Dual-Head PET System.
Influence of Rotation Increments on Imaging Performance for a Rotatory Dual-Head PET System.
复制标题
旋转增量对旋转双头 PET 系统成像性能的影响
DOI：
10.1155/2017/8615086
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发表时间：
2017
影响因子：
--
通讯作者：
Liang J
中科院分区：
文献类型：
--
作者：
Meng F;Cao X;Cao X;Wang J;Li L;Chen X;Zhu S;Liang J
For a rotatory dual-head positron emission tomography (PET) system, how to determine the rotation increments is an open problem. In this study, we simulated the characteristics of a rotatory dual-head PET system. The influences of different rotation increments were compared and analyzed. Based on this simulation, the imaging performance of a prototype system was verified. A reconstruction flowchart was proposed based on a precalculated system response matrix (SRM). The SRM made the relationships between the voxels and lines of response (LORs) fixed; therefore, we added the interpolation method into the flowchart. Five metrics, including spatial resolution, normalized mean squared error (NMSE), peak signal-to-noise ratio (PSNR), contrast-to-noise (CNR), and structure similarity (SSIM), were applied to assess the reconstructed image quality. The results indicated that the 60° rotation increments with the bilinear interpolation had advantages in resolution, PSNR, NMSE, and SSIM. In terms of CNR, the 90° rotation increments were better than other increments. In addition, the reconstructed images of 90° rotation increments were also flatter than that of 60° increments. Therefore, both the 60° and 90° rotation increments could be used in the real experiments, and which one to choose may depend on the application requirement.
