Quantification Accuracy and Accumulated Errors for Sphere Phantom
| True sphere volume (mL) | VVOI (mL) | CE | ĉA (kBq/mL) | Mean difference (ĉA vs. cA) (%) | SE of difference (%) |
|---|---|---|---|---|---|
| 16 | 15.97 (0.1%) | 0.80 (0.1%) | 708.3 (6.5%) | −2.8 | 8.0 |
| 8 | 8.02 (0.1%) | 0.74 (0.1%) | 749.4 (6.5%) | +2.8 | 8.5 |
| 4 | 3.94 (0.6%) | 0.71 (0.2%) | 684.0 (6.6%) | −6.2 | 7.7 |
| 2 | 2.08 (1.0%) | 0.61 (0.6%) | 685.3 (6.8%) | −6.0 | 7.9 |
| 1 | 0.98 (0.8%) | 0.42 (0.8%) | 679.7 (6.7%) | −6.8 | 7.8 |
| 0.5 | 0.52 (1.6%) | 0.29 (1.4%) | 708.8 (7.1%) | −2.8 | 8.4 |
Values in parentheses are percentages of accumulated relative SEs due to measurement instrumentation. True activity concentration cA is 729.0 (relative SE, 5.0%), and calculated system volume sensitivity SVol is 10.3 (relative SE, 6.5%).