part of has input magnetic resonance imaging procedure angiography magnetic resonance angiography procedure 2023-02-21T19:27:13Z MRA A procedure that uses radio waves and a powerful magnet linked to a computer to create detailed pictures of the blood vessels and blood flow inside the body. A dye may be injected into a vein to make the blood vessels and blood flow easier to see. (NCI) MR angiography blood vasculature