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3D Tomography back-projection parallelization on Intel FPGAs using OpenCL

Abstract : This article deals with the evaluation of FPGAs resurgence for hardware acceleration applied to computed tomography on the back-projection operator used in iterative reconstruction algorithms. We focus our attention on the tools developed by FPGAs manufacturers, in particular the Intel FPGA SDK for OpenCL, that promises a new level of hardware abstraction from the developers perspective, allowing a software-like programming of FPGAs. Our first contribution is to propose an accurate memory benchmark, and we follow with an evaluation of different custom OpenCL implementations of the back- projection algorithm. With some clues on memory fetching and coalescing, we then further tune designs to improve performance. Finally, a comparison is made with GPU implementations, and a preliminary conclusion is drawn on FPGAs future for computed tomography.
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Contributor : Nicolas Gac <>
Submitted on : Monday, January 13, 2020 - 3:47:10 PM
Last modification on : Wednesday, April 8, 2020 - 4:05:32 PM
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Maxime Martelli, Nicolas Gac, Alain Mérigot, Cyrille Enderli. 3D Tomography back-projection parallelization on Intel FPGAs using OpenCL. Journal of Signal Processing Systems, Springer, 2018, ⟨10.1007/s11265-018-1403-6⟩. ⟨hal-01831884⟩



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