There is no radiation. The test takes 30 minutes to 1 hour. If you have any metal in your body other than dental fillings, you should inform your doctor prior to the test, because it utilizes a very strong magnet.
Computerized tomography is another way to take a picture of the brain using x-rays.
The test takes about 30 minutes. This test is safe and painless. These are tests designed to look at blood flow either in the brain or in the neck. They are performed by using sound waves and are safe and painless. The tests take less than 1 hour.