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FIGURE 6. Mean percentage of variability in circumferential profiles of reconstructed slices of normal phantoms in straight and angled orientations acquired with 180° and 360° orbits. Using 180° acquisition orbit, variability increased significantly (P < 0.0001, ANOVA) with increasingly off-center position in both straight and angled orientations. In contrast, variability did not significantly differ using 360° acquisition orbit (P = not statistically significant [ns], ANOVA). Variability in straight versus angled phantom orientations was significantly different only in center and 5-cm off-center positions (P < 0.01, unpaired t test).
