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Brain MRI: MRI brain scan (in the axial planeâthat is, slicing from front-to-back and side-to-side through the head) showing a brain tumor at the bottom right. The fMRI is a series of MRIs that measures both the structure and the functional activity of the brain through computer adaptation of multiple images.
The gray outer surface is the surface of the brain from MRI and the inner colored structure is cingulate gyrus, part of the brain's emotional system visualized with PET. Photo by Monte S. Buchsbaum, M.D. Also developed in the 1970s, PET scans allow one to observe blood flow or metabolism in any part of the brain. In a PET scan, the subject is injected with a very small quantity of radioactive glucose. The PET then scans the absorption of the radioactivity from outside the scalp.