5 Answers

 Magnetic Resonance Imaging should not be required because its accuracy has not been proven. 

 This is akaQA, a general question and answer forum. Please contact your doctor/health care facility for information.

No Brain Scans for Mental Illness

http://www.cchr.org/quick-facts/no-brain-scans-for-mental-illness.html

There is something called a SPECT scan ...

....MRI indicates abnormalities

....I don't think it shows chemical imbalances 

I had to have an MRI for my spine,Yes things do get a bit closed in in there,if you have a problem with that sort of machine,they can put you in a open Mri scan,,however they may use a MRI on your head to find a physical reason for your actions..but unlikely,however speak to your doctor about it..Here is a photo of the 2 different MRI machines..>>>>>>>><<<<<<<<.. 

They let you wear earplugs and listen to music. They put pillows and rolled up towels around you to make you comfortable. They give you a button to push if you want the MRI to stop.