What is angiography?

Angiography is x-ray visualization of blood vessels after injection of a radiopaque material.
coronary a. Angiography of the arteries supplying the heart muscle.
fluorescein a. Photographic visualization of the passage of fluorescein through blood
vessels within the eye after an intravenous fluorescein injection.
magnetic resonance a., MR a. Visualization of blood vessels by means of magnetic resonance sequences that enhance the signal from circulating blood while suppressing signals from other tissues.

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