Coronary Stents: In Vitro Aspects of an Angiographic and Ultrasound Quantification With In Vivo Correlation

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The validity of quantitative coronary angiography (QCA) after stent placement has been questioned because the optical density of a metallic stent, added to the density of a contrast-filled lumen, could affect border definition.


QCU is sufficiently precise for the assessment of the coronary lumen after stenting. QCA can be used as an accurate method of poststent assessment, except when a very mild recurrence within a highly opaque stent is measured. In that instance, QCA may underestimate the luminal diameter. (Circulation. 1998;98:1495-1503.)

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