MRI
Known as magnetic resonance imaging, it uses very strong electromagnets of strength between 1.5 to 3 Teslas. This magnetic field forces protons in our body to align in a particular orientation and when a electromagnetic wave is passed through the body it causes protons of hydrogen to vibrate and strain against the magnetic field. When the waves pulses are turned off, the protons in our body realign themselves and loses the energy gain when the em wave is pulsed through the body, the different energy levels in which are produced due to protons realigning themselves are picked up by sensors in the mri and the type of tissue and images are produced.