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FIGURE 5. (A) Patient positioning in clinical PET/CT scanner with armrest to support arms above head during combined scanning. (B and C) Axial CT images (windowed) illustrate patient positioning with vacuum-lock bag (arrow) placed inside armrest (arrowhead) (B) and with head supported by cushion (arrow) placed in front of armrest (C). Measured CT attenuation values of cushion, armrest, and vacuum-lock bag were –970 HU, –900 HU, and –940 HU, respectively.

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