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 and. What does an mri of the brain show by looking at mri images your doctor can see details of blood flow and fluids surrounding the brain which can help determine abnormalities in the brain relating to arteries and veins an mri brain scan also shows brain lesions a brain lesion appears as a dark or light spot that does not look like normal brain tissues brain lesions may be present due to multiple sclerosis or as a result of an infection or a tumor. Magnetic resonance imaging of the brain uses magnetic resonance imaging mri to produce high quality two dimensional or three dimensional images of the brain and brainstem without the use of ionizing radiation x rays or radioactive tracers. Mri is the most sensitive imaging method when it comes to examining the structure of the brain and spinal cord it works by exciting the tissue hydrogen protons which in turn emit electromagnetic signals back to the mri machine the mri machine detects their intensity and translates it into a gray scale mri image
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