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Computation time (s) per iteration for the CGLS step in single and multiple GPU reconstructions.
| Protocol | Resolution | Single GPU | Multi-GPU | Speedup |
|---|---|---|---|---|
| Full-fan (121 projections) | 512 × 512 × 70 | 9.15 | 2.67 | 3.43 |
| 256 × 256 × 70 | 3.15 | 0.87 | 3.62 | |
| 128 × 128 × 70 | 1.26 | 0.36 | 3.50 | |
| Half-fan (164 projections) | 512 × 512 × 70 | 10.20 | 3.09 | 3.30 |
| 256 × 256 × 70 | 3.42 | 0.96 | 3.56 | |
| 128 × 128 × 70 | 1.32 | 0.36 | 3.67 |
