- If you have a heart pacemaker.
- If you have had your heart valves replaced by metal ones.
- If you have aneurysm clips in your brain.
- If you have ever had metal fragments in your eyes.
- In the first three months of pregnancy.
- If you have a cochlear implant or an ocular implant.
- If you have shrapnel or bullet wounds.
Although there are no known effects of an MRI scan on pregnancy, scans are avoided in the first three months of pregnancy.
Before your scan you will be asked to fill in a safety questionnaire. It is most important that you answer all the questions accurately.