Table 3.
Quantification errors between activity concentrations calculated with the conventional method and with the SBVR method for different time per view settings (minus sign – overestimation)
| Sphere volume (VOI volume) [cc] | Phantom NEMA Val. acquisition validation | |||||
|---|---|---|---|---|---|---|
| Quantification error (%) | ||||||
| Time per view: 30-s | Time per view: 20-s | Time per view: 10-s | ||||
| SBVR Method (CF/ SBVR) | Conv. Method (CF) | SBVR Method (CF/ SBVR) | Conv. Method (CF) | SBVR Method (CF/ SBVR) | Conv. Method (CF) | |
| 26.52 (22.7 cc) | 0.16% (4.07/12.16) | − 3.65% (3.92) | 1.72% (4.07/12.07) | − 1.78% (3.92) | 4.56% (4.05/11.82) | 1.39% (3.92) |
| 11.49 (10.3 cc) | 5.77% (3.15/8.90) | 6.65% (3.19) | 8.25% (3.13/8.71) | 9.69% (3.19) | 4.48% (3.19/9.32) | 4.48% (3.19) |
| 5.71 (6.36 cc) | 9.34% (2.03/5.53) | 30.28% (2.64) | 8.84% (2.05/5.67) | 29.19% (2.64) | 4.41% (2.09/6.11) | 24.32% (2.64) |
VOI, Volume of interest; CF, Calibration factor [cps/MBq]; and SBVR, Sphere-to-background counts/voxel ratio