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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.
A brain positron emission tomography (PET) scan is an imaging test of the brain. It uses a radioactive substance called a tracer to look for disease or injury in the brain. A PET scan shows how the brain and its tissues are working. Other imaging tests, such as magnetic resonance imaging (MRI) and computed tomography (CT) scans only reveal the structure of the brain. A PET scan requires a small amount of radioactive material (tracer).