Question

how do radiography and sonography compare?
each technique increases the risk of developing cancer.
radiography uses x - rays, but sonography uses radio waves.
each technique uses mechanical waves.
radiography uses ionizing radiation, but sonography does not.

Explanation:

Radiography employs ionizing radiation (X - rays) which can be harmful in high doses. Sonography uses high - frequency sound waves (mechanical waves), not ionizing radiation, and is generally considered safer in terms of radiation risk. It doesn't increase cancer risk like high - dose ionizing radiation can. Also, sonography doesn't use radio waves.

Answer:

D. Radiography uses ionizing radiation, but sonography does not.