A rapid approach for point spread function and detection efficiency estimation of Compton camera based on GPU-accelerated differential transmission probability

Zhiyang Yao; Yongshun Xiao

doi:10.1117/12.2627383

27 March 2022 A rapid approach for point spread function and detection efficiency estimation of Compton camera based on GPU-accelerated differential transmission probability

Zhiyang Yao, Yongshun Xiao

Author Affiliations +

Proceedings Volume 12169, Eighth Symposium on Novel Photoelectronic Detection Technology and Applications; 12169CQ (2022) https://doi.org/10.1117/12.2627383
Event: Eighth Symposium on Novel Photoelectronic Detection Technology and Applications, 2021, Kunming, China

Abstract

Compton camera has great potential in nuclear medicine imaging, and the pre-calculation and evaluation of the point spread function (PSF) and detection efficiency can provide important help for the optimization of the Compton camera systems and the improvement of image reconstruction quality. In this paper, we propose a method for calculating the spatial PSF and detection efficiency of the Compton camera system based on differential transmission probability and GPU acceleration. Different from the existing assumptions based on the uniform distribution of photon action positions in the detector, we consider the changes in the transmission probability at different action positions to obtain a more accurate calculation of the spatial point spread function. Besides, we combine the advantages of GPU parallel computing to divide the calculation of transmission probability into subsets of differential voxels for parallel computing, which greatly improves the calculation speed. The proposed approach could complete the calculation of the detection efficiency in the region of interest of the Compton camera system in about 10 seconds and complete the accurate evaluation of the Compton camera system's spatial PSF within half an hour, with the deviation of less than 1 mm. The rapid estimation of the PSF and the detection efficiency of the Compton camera system obtained by the proposed method could provide the performance estimation and help the optimization of the Compton camera design, and can also improve the accuracy of image reconstruction by using the PSF.

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Zhiyang Yao and Yongshun Xiao "A rapid approach for point spread function and detection efficiency estimation of Compton camera based on GPU-accelerated differential transmission probability", Proc. SPIE 12169, Eighth Symposium on Novel Photoelectronic Detection Technology and Applications, 12169CQ (27 March 2022); https://doi.org/10.1117/12.2627383

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KEYWORDS

Cameras

Point spread functions

Monte Carlo methods

Imaging systems

Parallel computing

Doppler effect

Nuclear medicine

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