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Fig. 4C —53-year-old man with lymphoma (not shown). CT-based
attenuation-correction PET images (B, D) and CT scans (A, C)
obtained without (A, B) and with (C, D) IV contrast material.
Even in regions of very high density in right subclavian vein, presence of IV
contrast material has no noticeable effect on attenuation-corrected images.
Newer attenuation-correction algorithms have reduced or eliminated problem of
artifactually increased activity that previously occurred in regions of high
contrast enhancement.
