An MRI consist of a tube with a bed that slides into it, for a form of x-ray that consists of radio waves and magnets which projects multiple images of the area of the body being observed. There is absolutely no pain. You will be given ear plugs as it is a noisy test. Sounds like a bunch of hammer clicks. Sometimes it is ordered with and/or without contrast. Contrast is simply an injection in a vein of the arm of a substance called "Gatallinium". It helps to illuminate the area in question for better pictures. An MRI covers many formerly painful tests. It is a wonderful tool for diagnosis. If a patient is claustrophobic, they can let the radiologist know when you schedule, and they will use an 'open' MRI (no side walls, and / or a shorter tube).
A Milegram is a one hour neurological test, often times called outpatient or same day surgery, performed by a neurosurgeon. The area of the spine to be examined is numbed, and you are sedated. The doctor proceeds, while at the same time using a monitor to see the interior of your spine at various points in question. When the doctor is finished, you will stay in recovery for 3 to 4 hours on your back, with your head at a 30 degree angle. This prevents the possibility of an awful headache, while the minimal amount of spinal fluid that was removed, more or less replaces itself.
So one test is like a 45min. type of ex-ray, while the other is an actual medical procedure, with sedation and a neuro performing the the test.
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