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Image analysis in patients with cancer studied with a combined PET and CT scanner
M Charron1, T Beyer, N N Bohnen
1University of Pittsburgh PET Facility, University of Pittsburgh Medical Center, Pennsylvania, USA.
Purpose:
To compare combined whole-body PET and CT images of different cancers with PET images alone.
Materials And Methods:
Thirty-two patients with known or possible cancers were examined using a combined positron emission tomographic (PET) and computed tomographic (CT) scanner. All data were acquired using this same combined scanner. After an injection of F-18 fluorodeoxyglucose (FDG), noncontrast helical CT imaging of the neck, chest, abdomen, or pelvis was performed. The spiral CT was followed by a PET scan covering the same axial extent as the CT.
Results:
Coregistered PET-CT images identified and localized 55 lesions. In 10 patients (31%), areas with variable amounts of normal physiologic FDG uptake were distinguished from potential uptake of FDG in a nearby neoplastic lesion. Improved localization was achieved in 9 patients (for a total of 13 lesions, or 24%).
Conclusion:
Combined PET-CT images appear more effective than PET images alone to localize precisely neoplastic lesions and to distinguish normal variants from juxtaposed neoplastic lesions.