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MRI can produce very clear and detailed pictures of brain structures. Often, the images take the form of cross-sectional "slices." The images of these
slices are obtained through the use of "gradient magnets" to alter the
main magnetic field in a very specific area while the magnetic force is
being applied. This allows the MRI technician to pick exactly what area
of the person's brain he or she wants an image of.
Unlike PET, MRI does not require the subject to be injected with a
tracer substance.
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