TABLE III.
Timea per 10 iterations for OSEM and 10 000 iterations for OE for the dataset with 8.7 × 106 counts and image dimensions 80 × 80 × 80. Letters S + E4 indicate correction for the spatial and energy resolutions with four sampling points, S + E8 with eight sampling points.
| OSEM (16 subsets) | OE | |||
|---|---|---|---|---|
| No RR | RR(S + E4) | RR(S + E8) | No RR | RR S + E |
| 6920 s | 176 400 0 sb (20 days) | 282 960 00 sb (1 yr) | 96 000 s | 172 000 s |
a
Estimates based on a single thread at Xeon 5504@2.0 GHz.
b
Estimates based on the number of assumed sampling points and the time needed for projection/backprojection operations, and the actual reconstructions were not performed.