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Configuration of a modified body phantom simulating bowel activity and lumbar spine metastases (a). Uptake in sphere 1 (thick arrows) is overlaid with uptake of the tube-shaped chamber in the anteroposterior planar image (b) but not in the mid-sagittal plane of SPECT (c). Sphere 2 is used as reference. ANT anterior, SUP superior, POST posterior, INF inferior, R right, L left, BKG background
