¹⁸F-FDG PET/CT is being used in a variety of diseases to better delineate target tumor boundaries before radiotherapy. Here, for a patient with pancreatic cancer, the yellow outline based on the CT scan was made by a radiation oncologist, whereas the blue outline based on the PET scan was made by a nuclear medicine physician. The difference between the 2 outlines reflects a real difference between apparent tumor locations on the 2 studies.
See page 1655.