To diagnose the medical conditions, MRI technique is used. Which is not used in MRI?

Explanation

Magnetic Resonance Imaging (MRI) is a medical imaging technique. To obtain images of body organs through MRI, a strong magnetic field and radio waves are used. It is also called Magnetic Resonance Tomography (MRT). Both X-rays and gamma rays are high-frequency ionizing radiation, meaning they have sufficient energy to remove electrons from an atom or molecule. In both ultrasound and MRI, no ionizing radiation is used.