A Fast Filtered-Back-Projection Algorithm for Image Reconstruction of Compton Camera

doi:10.19596/j.cnki.1001-246x.8037

Abstract

Abstract: A Compton camera consisting of a CZT pixel detector and a NaI scintillator array was proposed. Factors that affect angular resolution of the camera, including geometry of detectors, energy resolution and Doppler effect of CZT detector, were analyzed. Overall angular resolution was between 5.1° and 5.6° and geometry of detectors was confirmed as main factor that limits angular resolution of the camera. A filtered-back projection algorithm was analytically deduced. The angular resolution was 1.7° as broadening was omitted, and 4.2° as broadening was considered. Geant4 simulations were performed and the data were reconstructed with a practical method of filtered-back projection algorithm. Angular resolution was 1.7° as broadening was omitted and 5.1° as practical broadening factors of Compton camera was considered. Parallel acceleration with GPU in the framework of OpenCL was applied in the reconstruction and the acceleration ratio was 79.

Key words: Compton camera, filter-back-projection algorithm, GEANT4 simulation, paralleled computing with OpenCL

CLC Number:

R445.5

YAN Xiaosong, YANG Jianlun, YANG Yiwei. A Fast Filtered-Back-Projection Algorithm for Image Reconstruction of Compton Camera[J]. CHINESE JOURNAL OF COMPUTATIONAL PHYSICS, 2020, 37(2): 153-162.

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