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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