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Table 2 Performance of different implementations (in seconds)

From: Fast reconstruction of 3D volumes from 2D CT projection data with GPUs

Dataset Approach Backprojection time Total time Speedup over MATLAB Speedup over C
Phantom MATLAB 51.06 51.11
Phantom C 3.93 3.95 12.94
Phantom C + OpenMP (4 threads) 0.85 0.89 57.43 4.44
Phantom OpenCL (NVIDIA) 0.01 0.30 170.37 13.17
Phantom CUDA (NVIDIA) 0.01 0.30 170.37 13.17
Phantom OpenCL (AMD) 0.01 0.32 159.72 12.34
Mouse scan MATLAB 33760.40 33777.33
Mouse scan MATLAB PCT 22506.49 22513.90 1.5
Mouse scan C 18451.77 18462.60 1.83
Mouse scan C + OpenMP 5112.94 5615.65 6.01 3.29
Mouse scan OpenCL (NVIDIA) 49.44 60.45 558.76 305.42
Mouse scan CUDA (NVIDIA) 47.79 58.87 573.76 313.62
Mouse scan OpenCL(AMD) 16.01 28.02 1205.47 658.91