MRI /ˌem ɑːr ˈaɪ/ BrE AmE noun medical
1 . [uncountable] (magnetic resonance imaging) the process of using strong ↑ magnetic field s to make a picture of the inside of someone’s body for medical reasons ⇨ CT scan , X-ray
2 . [countable] a picture of the inside of someone’s body produced with ↑ MRI equipment:
Brian had an MRI taken Sunday.