Table 2.
Liver tissue reference and lesion metrics using OSEM (3 iterations/16 subsets, and a 5-mm gaussian postprocessing filter) and BSREM image reconstruction, both including TOF and PSF recovery, with an acquisition time of 2 min/bed position. Mean (range).
| Reconstruction | Background SUVmean | Noise BV % | SNR | SBR |
|---|---|---|---|---|
| OSEM | 5.2 (1.7-8.9) | 15.2 (10.6-22.1) | 120.9 (21.7-634.2) | 4.5 (0.7-46.2) |
| BSREM β 100 | 5.2 (1.7-9.1) | 36.4 (21.6-62.2) | 105.1 (20.4-287.7) | 8.2 (2.0-60.9) |
| BSREM β 200 | 5.2 (1.7-9.1) | 22.3 (14.5-37.2) | 136.0 (27.6-448.6) | 6.8 (1.4-56.4) |
| BSREM β 300 | 5.2 (1.7-9.1) | 17.1 (11.7-27.1) | 152.2 (31.6-569.8) | 6.1 (1.2-54.0) |
| BSREM β 400 | 5.2 (1.7-9.1) | 14.4 (9.5-21.9) | 163.7 (33.1-660.6) | 5.7 (1.0-51.9) |
| BSREM β 500 | 5.2 (1.7-9.1) | 12.8 (8.4-18.6) | 171.1 (34.7-719.1) | 5.4 (0.9-50.3) |
| BSREM β 600 | 5.2 (1.7-9.1) | 11.7 (7.5-17.0) | 177.7 (37.1-775.5) | 5.1 (0.8-49.0) |
| BSREM β 700 | 5.2 (1.7-9.0) | 10.8 (7.0-15.4) | 183.5 (38.6-826.6) | 4.9 (0.8-47.6) |
| BSREM β 800 | 5.2 (1.7-9.0) | 10.2 (6.6-14.2) | 188.2 (39.7-885.9) | 4.8 (0.7-46.5) |
| BSREM β 900 | 5.2 (1.7-9.0) | 9.8 (6.2-13.8) | 191.4 (41.1-927.6) | 4.6 (0.7-45.6) |
| BSREM β 1000 | 5.2 (1.7-9.0) | 9.3 (5.9-13.0) | 194.5 (42.0-945.2) | 4.5 (0.7-44.5) |
| BSREM β 1100 | 5.2 (1.7-9.0) | 9.0 (5.7-12.6) | 196.2 (42.3-961.3) | 4.4 (0.7-43.6) |
| BSREM β 1200 | 5.2 (1.7-9.0) | 8.7 (5.5-11.7) | 199.0 (41.1-1019.1) | 4.3 (0.7-42.8) |
| BSREM β 1300 | 5.2 (1.7-9.0) | 8.4 (5.3-11.7) | 201.2 (41.5-1043.1) | 4.2 (0.6-42.0) |
BSREM: block-sequential regularized expectation maximization; BV: background variability; OSEM: ordered subsets expectation maximization; PSF; point-spread function; SBR: signal-to-background ratio; SNR: signal-to-noise ratio; SUV: standardized uptake value; TOF: time-of-flight.