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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.
Brain scans. To show abnormalities like a brain tumor, a contrast dye is often used. The dye is injected into a vein in the arm. A brain tumor generally soaks up more dye than normal brain tissue and shows up clearly on the scan; occasionally, a brain tumor does not absorb more dye.T scans. CT scans are a type of X-ray that creates a three-dimensional picture of the head by scanning the head from multiple different angles. A computer combines these images into a detailed, cross-sectional view that shows abnormalities in the brain, or tumors.