angioscopy

noun

an·​gi·​os·​co·​py ˌan-jē-ˈä-skə-pē 

plural angioscopies

: examination of the interior of a blood vessel especially by means of an angioscope

… angioscopy can help doctors determine what kinds of materials are blocking the artery and what kind of treatment might best provide relief for heart disease patients.

—William R. Wineke, The Wisconsin State Journal

Recent angioscopy and autopsy studies have shown fissures in atheromata after percutaneous transluminal coronary angioplasty.

—American Family Physician