Which imaging uses ionising radiation?

Which imaging uses ionising radiation?

• A. Fluoroscopy and CT
• B. MRI and CT
• C. Ultrasound and MRI
• D. MRI and PET

Answer: (A)

Ionising radiation is produced by X-ray based imaging. Fluoroscopy and CT both use X-rays to create images, so they involve ionising radiation. MRI, on the other hand, relies on magnetic fields and radiofrequency energy, which do not ionise atoms, and ultrasound uses high-frequency sound waves, also non-ionising. So the pair that both employ ionising radiation is the one with fluoroscopy and CT.

Ionising radiation is produced by X-ray based imaging. Fluoroscopy and CT both use X-rays to create images, so they involve ionising radiation. MRI, on the other hand, relies on magnetic fields and radiofrequency energy, which do not ionise atoms, and ultrasound uses high-frequency sound waves, also non-ionising. So the pair that both employ ionising radiation is the one with fluoroscopy and CT.