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Radiology, Vol 170, 329-332, Copyright © 1989 by Radiological Society of North America
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LG Strauss, JH Clorius, P Schlag, B Lehner, B Kimmig, R Engenhart, M Marin-Grez, F Helus, F Oberdorfer and P Schmidlin
Institut fur Radiologie und Pathophysiologie, Deutsches Krebsforschungszentrum, Heidelberg, Federal Republic of Germany.
Positron emission tomography (PET) was used in the follow-up of patients with colorectal malignancies to differentiate between recurrent colorectal tumor and scar. Patients were examined with oxygen- 15-labeled water and with fluorine-18-labeled deoxyglucose (FDG). FDG was injected intravenously to assess tumor metabolism. The tracer concentration was quantitatively evaluated by means of a region-of- interest technique and standardized for both injected dose and body volume. Of 29 patients, 21 had recurrent colorectal malignancy, and eight had a nonmalignant mass. All malignancies were seen on the PET cross sections. Nonmalignant lesions had a low FDG accumulation on images obtained 60 minutes after injection. While the tumor-soft tissue ratio was highest shortly after the intravenous injection of FDG, the tumor-scar ratio was highest 60 minutes after injection. It was possible to differentiate tumor from non-malignant tissue with FDG with the use of standardized concentration values and tumor-soft tissue ratios. Imaging with O-15-labeled water gave no additional information.
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