Which statement about MRI safety is true?

• A. It uses ionizing radiation
• B. It requires invasive procedures
• C. It uses contrast agents in all cases
• D. It does not use radioactive materials

Answer: (D)

MRI safety hinges on the energy used to create images. MRI relies on strong magnetic fields and radiofrequency pulses, which do not ionize atoms, so it does not involve ionizing radiation or radioactive materials. This is why MRI is considered noninvasive and safe in that specific sense. Contrast agents are sometimes used to improve images, but not in every case, and their use doesn’t involve radioactivity. Because of this, the statement that MRI does not use radioactive materials accurately reflects its safety profile.