Table 4.
Quantification errors between activity concentrations calculated with the conventional method and the SBVR method for different time per view settings for spheres and liver in the Torso Phantom (minus sign – overestimation)
| Organ/Sphere volume (VOI volume) [cc] | Torso Val. Phantom 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) | − 7.30% (4.24/1.50) | − 16.06% (3.92) | − 8.14% (4.09/12.43) | − 12.83% (3.92) | − 10.07% (3.92/9.93) | − 10.63% (3.92) |
| 5.71 (6.36 cc) | − 9.34% (2.98/63.90) | − 23.42% (2.64) | − 8.18% (2.98/105.61) | − 26.21% (2.64) | − 10.18% (2.98/70.61) | − 24.73% (2.64) |
| Liver (~ 1200 cc) | − 1.50% (4.87/15.0) | 1.10% (5.0) | 3.87% (4.87/12.0) | 6.34% (5.0) | 3.31% (4.87/11.0) | 5.82% (5.0) |
VOI, Volume of interest; CF, Calibration factor [cps/MBq]; and SBVR, Sphere-to-background counts/voxel ratio