What imaging room should no metal enter?

• A. MRI
• B. CT
• C. Ultrasound
• D. Scintigraphy

Answer: (A)

MRI relies on a strong magnetic field, so metal should not enter the room. The powerful magnet can attract ferromagnetic objects, turning them into dangerous projectiles, and metal can heat up or move under the radiofrequency energy, risking burns or injury to the patient. Some implants or devices may also be unsafe or require special evaluation before MRI.

Other imaging methods—CT, ultrasound, and scintigraphy—do not use such a strong magnetic field, so metal objects don’t pose the same safety risk from the room’s field. They can be affected by metal in terms of image quality or artifacts, but the fundamental safety concern that metal objects pose in an MRI environment isn’t present to the same extent.