Article Figures & Data
Figures
- FIGURE 1.
Total counts from identical circular regions placed over the 4-cm sphere and over an area of background were used to determine tumor-to-background contrast.
- FIGURE 2.
Anterior and posterior images using high- and medium-energy collimators for acquisition speeds of 20 (A), 60 (B), and 100 (C) cm/min. All images have been adjusted to the same color scale to better illustrate differences in image quality.
Tables
Experiment Kidneys Lungs Liver Spleen Heart Background Sphere 1 51.1 38.5 40.3 76.2 118 0.148 185 2 41.1 23.3 23.3 49.2 8.88 0.148 144 3 51.1 38.5 40.3 76.2 118 0.148 74 - TABLE 2
Half-Life (t1/2) with 95% Confidence Interval (CI) and Tumor-to-Background Contrast Ratios for All Experiments Using Both High-Energy and Medium-Energy Collimators
Experiment 1 Experiment 2 Experiment 3 Acquisition speed (cm/min) Collimator type t1/2 (d) 95% CI (d) Contrast ± 1σ t1/2 (d) 95% CI (d) Contrast ± 1σ t1/2 (d) 95% CI (d) Contrast ± 1σ 20 High-energy 8.3 8.1, 8.6 6.6 ± 0.7 7.9 7.6, 8.2 7.5 ± 0.7 8.4 7.8, 9.2 3.9 ± 0.5 Medium-energy 8.5 8.2, 8.7 2.5 ± 0.1* 7.8 7.5, 8.1 3.0 ± 0.1* 8.6 8.0, 9.2 2.4 ± 0.3* 100 High-energy 8.4 8.0, 8.8 6.6 ± 0.3 8.0 7.7, 8.4 6.8 ± 0.4 8.4 7.6, 9.2 4.0 ± 0.5 Medium-energy 8.5 8.2, 8.8 2.6 ± 0.2* 7.9 7.6, 8.1 3.0 ± 0.1* 8.5 8.0, 9.0 2.3 ± 0.2* ↵* P < 0.01, compared with high-energy collimators at same speed.
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