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Fig. 19 Example of PET/CT images obtained extending from the head to the mid-thighs. Fused
CT and PET images in a sagittal, b coronal, and c axial projections. CT portion of the scan is in
grayscale, with color over-projection of physiologic (PET) activity. Areas of light yellow to orange
represent areas of increased radiotracer uptake, and areas of red, lower uptake. Note that there is a
normal physiologic distribution of radiotracer, with increased uptake in the brain, and increased
activity also seen in the bowel and bladder, not to be mistaken for pathologic uptake
Fig. 20 PET/CT images obtained extending from the head to the mid-thighs. Fused CT and PET
images in a sagittal, b coronal, and c axial projections. Areas of light yellow to orange again
represent areas of increased radiotracer uptake, and areas of red, lower uptake. Note that there is a
normal increased and expected physiologic uptake of radiotracer, in the brain and heart, with
increased activity also noted in the liver, kidneys. This case, however, also demonstrates foci of
abnormally increased radiotracer uptake in the spine, diagnosed as metastatic disease to bone.
(compare Fig. 19 )
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