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Every MRI machine is different. When your friend has her preMRI screeening they will ask her what her weight is. If the machine will not accomodate her, they will let her know. The majority of the older MRI machines at older facilities have a weight limit of 250lbs.
The MRI machine itself contains a large magnet. Hydrogen atoms (i.e., protons) in the brain rotate themselves to a particular orientation with respect to the magnet. The MRI machine records the radio frequencies emitted by the hydrogen atoms. MRI scanning results in high-resolution structural images of the brain.