Fasting restrictions and eating precautions before the exam are determined by the specific examinations and rules of the testing institution. It is recommended that you check with your doctor before having the scan. Fear of confined places or severe anxiety may need the use of medication to relax and keep movement to a minimum.
However, if you have a phobia of being in a small place or are anxious, you may want to consider taking some sedatives before your brain MRI. The use of sedation may result in vomiting, with the possibility of aspiration of stomach contents, necessitating the need to fast thereafter.
If you need to have an oral or intravenous contrast material administered during your scan, you should fast for 4-6 hours before the procedure. You may be required to bring blood tests to check your urea and creatinine levels.
A high creatinine level indicates that your kidneys are not performing at their peak. The clinician may elect not to use gadolinium, may choose to use a lesser dosage, or may decide to arrange renal dialysis immediately after the MRI.
Because magnetic resonance imaging (MRI) employs powerful magnetic fields, it is recommended that individuals who have certain types of medical implants avoid having an MRI scan. Synthetic heart valves, brain aneurysm repair clips, inner ear implants, pacemakers, shrapnel, gunshot wounds, and metallic joint replacements are some instances of the medical devices that might cause harm.