A special kind of mri called a functional mri fmri checks brain activity by measuring blood flow to certain areas of your brain an fmri can show the active areas of your brain while you do a task. Magnetic resonance imaging mri of the head is a painless noninvasive test that produces detailed images of your brain and brain stem an mri machine creates the images using a magnetic field . Magnetic resonance imaging mri of the head uses a powerful magnetic field radio waves and a computer to produce detailed pictures of the brain and other cranial structures that are clearer and more detailed than other imaging methods. A head mri magnetic resonance imaging is an imaging test that uses powerful magnets and radio waves to create pictures of the brain and surrounding nerve tissues it does not use radiation how the test is performed. Magnetic resonance imaging mri of the brain is a safe and painless test that uses a magnetic field and radio waves to produce detailed images of the brain and the brain stem an mri differs from a cat scan also called a ct scan or a computed axial tomography scan because it does not use radiation
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