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11C-glutamine biodistribution and tumor imaging in patient with metastatic colorectal cancer. (A and B) Whole-body PET (A) and PET/CT (B) images of 11C-glutamine showing normal-organ accumulation. High uptake was seen in bladder, liver, and pancreas. (C and D) Axial 11C-glutamine PET/CT fusion images corresponding to 2 lung nodules. Arrowheads point to lesions. Lesion–to–blood pool ratios from whole-body scan were 2.17 (C) and 2.59 (D).
