The type of wave used in MRI imaging is a type of radio wave. MRI, or Magnetic Resonance Imaging, utilizes a strong magnetic field along with radiofrequency waves to produce detailed images of organs and tissues within the body. The technology relies on the magnetic properties of hydrogen nuclei in water molecules in the body. When exposed to a magnetic field, these nuclei align and then emit radio waves when returning to their original state. MRI is particularly valuable for non-invasive imaging without the use of ionizing radiation.