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Fig. 1D —84-year-old woman with colon cancer metastatic to liver and refractory to hemicolectomy who had two prior radiofrequency ablation treatments of other lesions. PET scan obtained 4 weeks after ⁹⁰Y treatment shows marked interval improvement in appearance of liver with resolution of lesion hypermetabolism in right lobe. This example emphasizes advantage of PET over CT because CT shows residual lesion, whereas PET shows resolution of activity, suggesting complete response.