Article Figures & Data
Figures
- FIGURE 1.
(A) Variations in number of iterations required for gain calibration during observation period. (B) Variations in average error in gain calibration during observation period.
- FIGURE 2.
Variations in system energy resolution during observation period.
- FIGURE 3.
Variations in system timing resolution during observation period.
Tables
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.
- TABLE 2
Comparison of Lesion and Background SUVs for Image-Quality Phantom at Acceptance Testing and 12 Months Later
SUV… at acceptance testing 12 mo later SUV site Maximum Minimum Average Maximum Minimum Average Error* Lesion 1 (22 mm) 4.95 2.1 3.04 4.7 1.98 2.97 5.05% Lesion 2 (17 mm) 4.65 1.98 2.84 4.53 1.93 2.75 2.58% Lesion 3 (13 mm) 3.91 1.63 2.2 3.73 1.58 2.12 4.60% Lesion 4 (10 mm) 2.35 0.96 1.44 2.33 1.08 1.50 0.85% Background 1.36 0.98 1.20 1.34 1.03 1.15 1.47% ↵* Error in SUVmax estimation in second study compared with first study.
Parameter Iterations required for gain calibration Gain calibration error (%) Average energy resolution (%) Timing resolution (ps) Average 10.493 0.238 11.664 547.075 SD 0.812 0.026 0.147 1.772
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