Standardized Result High Field Magnetic Resonance Imaging . Brookhaven National Laboratory Chemistry Department. University of Minnesota. It is the home of the world's first 4 tesla whole body imaging instruments.
Some nuclei behave like magnetic spinning tops.
An MRI uses a magnetic field to position the spinning nuclei of the atoms being studied, then temporarily disturbs the orientation with a burst of energy from a radio frequency transmitter. The whole MRI procedure takes about 5 minutes. There are different MRI machines that use different field strengths. Some use 4 telsas, others use 9.4 tesla and 15 tesla. This procedure is not dangerous compared to others that expose the patient to radiation.