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Fig. 4B. —71-year-old man with neuroendocrine cancer. CT scan shows liver and tumor enhancement (metastases, arrows) after injection of 150 mL of contrast material with injection parameters identical to those used for A. Mean liver attenuation = 89.8 H; mean tumor attenuation = 29.9 H; liver-to-lesion difference = 59.9. No difference in lesion conspicuity is seen compared with Figure 1A, despite slightly improved liver enhancement, because of simultaneous increase in tumor attenuation.

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