noun
radiology
The medical specialty dealing with imaging techniques such as X-rays, CT, MRI, and radiation therapy.
彼は放射線学の専門医です。
He is a specialist in radiology.
放射線学の進歩により、早期発見が可能になった。
Advances in radiology have made early detection possible.
Compound of 放射線 (radiation) + 学 (study, -ology). The term is a direct calque from Western medical terminology.