What type of wave is used in MRI machine?

The correct answer is Magnetic waves. 

• MRI scanners use strong magnetic fields, magnetic field gradients, and radio waves to generate images of the organs in the body.
• MRI does not involve X-rays or the use of ionizing radiation, which distinguishes it from CT or CAT scans and PET scans.

Key Points

• MRI can be also known or called Magnetic Resonance imaging.
• In MRI the body is placed in a high strength magnetic field.
• This field is generated by a superconducting magnetic coil which is immersed in liquid helium.
• This field causes the alignment of the spins of the protons in the body of the patient.
• Pulses of radio waves are then used to excite the nuclei causing the alignment of the spins to undergo decoherence.
• When the spins realign, they release a radio signal which is picked up by antennae placed close to the body.
• from this signal and by modulating the radio wave pulses different types of MR images are reconstructed.
• This is the basis of MR imaging.