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FIGURE 4. SPECT short-axis slices and corresponding circumferential count profiles for normal phantom in center position and straight orientation using 180° and 360° acquisition orbits. Visually, all images appear homogeneous. Quantitative analysis by circumferential count distribution of apical, midventricular, and basal slices show mild inhomogeneity, possibly caused by slightly imprecise positioning of phantom. Patterns of circumferential count profiles are similar for 180° and 360° acquisition orbits.
