They may be required for longer periods and more frequently after radiosurgery, but we are not certain that is the case. The MRI is a machine that some people find noisy and claustrophobic. Some are less noisy than others, and some are equipped with mirrors so you can see out. If you have problems with claustrophobia, let someone know so you can be given medication that will help you relax. Don't worry too much though.
Some patients find the experience so soothing they have trouble staying awake.
It produces very high quality film and your time on the table is about 30 minutes total. It is the the only open, super conducting, Tesla magnet around. It has a sound system that will play CD's or tapes, and the technician can talk to you when needed. The films have to be properly reviewed and analyzed. This is for your own protection.