The warmth is caused by the RF pulses and has nothing to do with the magnet or iron levels. Basically the scanner behaves the same as a microwave oven.
That's why you have to enter the patient weight and size before scanning, in order to keep the SAR within acceptable values and limit body heating.
That's why you have to enter the patient weight and size before scanning, in order to keep the SAR within acceptable values and limit body heating.