Rapid construction of system response matrix based on geometric symmetries for the quad-head PET system

Jian Cheng; Fanzhen Meng; Yu Shi; Ye Mao; Chenfeng Li; Jimin Liang; Shouping Zhu

doi:10.1117/12.2534803

28 May 2019 Rapid construction of system response matrix based on geometric symmetries for the quad-head PET system

Jian Cheng, Fanzhen Meng, Yu Shi, Ye Mao, Chenfeng Li, Jimin Liang, Shouping Zhu

Proceedings Volume 11072, 15th International Meeting on Fully Three-Dimensional Image Reconstruction in Radiology and Nuclear Medicine; 110720M (2019) https://doi.org/10.1117/12.2534803
Event: Fully Three-Dimensional Image Reconstruction in Radiology and Nuclear Medicine, 2019, Philadelphia, United States

Abstract

The quad-head PET system has a compact structure which leads to the depth of interaction (DOI) blurring. The Monte Carlo (MC) simulation can eliminate the DOI effect significantly, and it has been utilized in the dual-head PET systems. For the quad-head PET system, the geometric symmetry is less, which makes the MC simulation difficult. The multi-ray method combined with the DOI model can also relieve the effect of the DOI blurring, but it is time-consumed. In this study, we focus on the rapid construction of the system response matrix (SRM) based on geometric symmetries for the multi-ray method. During the construction of the SRM, the SRM is divided into two parts: the SRM of the opposite detectors and the SRM of the adjacent detectors. The general processor unit (GPU) is utilized to improve the computation speed. The result shows that the computation time is largely decreased when the geometric symmetries are used. The simulation experiments indicate that the data of adjacent detector heads and the DOI model are helpful to improve the quality of the quad-head PET reconstruction.

Citation Download Citation

Jian Cheng, Fanzhen Meng, Yu Shi, Ye Mao, Chenfeng Li, Jimin Liang, and Shouping Zhu "Rapid construction of system response matrix based on geometric symmetries for the quad-head PET system", Proc. SPIE 11072, 15th International Meeting on Fully Three-Dimensional Image Reconstruction in Radiology and Nuclear Medicine, 110720M (28 May 2019); https://doi.org/10.1117/12.2534803

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