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. Author manuscript; available in PMC: 2018 Jan 10.
Published in final edited form as: IEEE Trans Comput Imaging. 2017 Feb 28;3(4):617–632. doi: 10.1109/TCI.2017.2675705

TABLE V.

Speedup performance of the FORBILD head phantom reconstruction in one iteration.

Unit: second Projection Backprojection
CPU-32 24.13 26.63
GPU-BL TOTAL KERNEL TOTAL KERNEL
2.75 2.25 2.78 1.92
GPU-BS 5.89 5.65 8.07 7.82