What is magnetic resonance imaging? | Explained
The story so far: For those trying to look inside the human body without surgery, magnetic resonance imaging is an indispensable tool. Because of the MRI technique’s use of strong magnetic fields, individuals with embedded metallic objects and metallic implants, including pacemakers, may not be able to undergo MRI scans. The superconducting magnet applies a magnetic field down the centre of the machine, such that the axes of roughly half of the hydrogen atoms in the part to be scanned are pointing one way and the other half are pointing the other way. After the big, powerful magnetic field comes on, the MRI machine activates three magnets that produce smaller magnetic fields that are weaker than the main field by about 80-times, if not more. MRI scans don’t pose any threats; once the magnetic fields are taken away, the atoms in the scanned part don’t remain affected.
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