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Because the MRI scanner uses a powerful magnet, you may not be able to have the test if there is metal in your body. Your doctors will need to check that the test is suitable for you. For example, you may not be able to have it if:
- you have a pacemaker
- you have certain types of artificial joints or heart valves
- you have clips in the head following brain surgery
- you have metal fragments in your body
People with dental fillings and bridges, hip and knee replacements can all be scanned safely.
We also prefer not to scan women in the early stages of pregnancy, although this is not known to be harmful.
