For a brain MRI, you will be asked to change into a hospital gown to ensure no ferromagnetic (metal) materials go into the scanner, as these can be dangerous near strong magnets. The MRI technologist will help guide you through this process.
You will lie on a table that moves into a long tube, and the scan typically takes about 30 minutes. The machine makes loud tapping or buzzing sounds as it captures images.

No special preparation is needed unless you experience claustrophobia. If you do, speak with your clinician or study coordinator about strategies or medications that may help.