Comparison of Image Quality at Acceptance Testing and 12 Months Later
| Insert diameter | ||||||
| Parameter | 10 mm | 13 mm | 17 mm | 22 mm | 28 mm | 37 mm |
| Contrast recovery | ||||||
| At acceptance testing | 34.70% | 51.43% | 60.83% | 72.13% | 73.88 | 77.65% |
| 12 mo later | 36.30% | 50.62% | 60.13% | 70.69% | 72.12 | 76.92% |
| Difference | +1.6% | −0.81% | −0.60% | −1.44% | −1.76% | −0.73% |
| Background variability | ||||||
| At acceptance testing | 8.65% | 7.89% | 7.05% | 6.15% | 5.46% | 5.04% |
| 12 mo later | 8.96% | 8.01% | 6.85% | 6.65% | 5.77% | 5.32% |
| Difference | +0.31% | +0.12 | −0.20% | +0.50% | +0.31% | +0.28% |
Scatter correction using filtered backprojection reconstruction was applied.