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FIGURE 3. (A) Topogram scans of 3 patients with different arm positions. Selected transverse CT images (center 50 Hounsfield units [HU], width 300 HU) at level of midliver are shown to illustrate magnitude of streaking artifacts. Streaks are reduced most in case when both arms are raised (right). (B) Male patient with lymphoma. Fused image shows involvement of retrocrural lymph node (arrow). Streak artifacts originating from positioning of patient with arms down degrade quality of CT and fused PET/CT images.
