CT of pediatric vascular stents used to treat congenital heart disease

AJR. American Journal of Roentgenology
Joachim G EichhornFrederick R Long

Abstract

The purpose of our study was to assess the visibility of lumen narrowing of pediatric vascular stents using various CT dose parameters in an in vitro model. Ten steel stents of varying designs and sizes commonly used in the treatment of congenital heart disease were implanted in polyvinyl chloride (PVC) tubes and three of the 10 stents were partially obstructed with wax by filling 25% (mild) to 60% (moderate) of the lumen with contrast material. On a 64-MDCT scanner, the stents were scanned at tube voltages (kVp) of 80, 100, and 120 and at tube currents (mA) of 40, 80, 120, and 160. CT measurements of inner-stent diameter, strut thickness, and percent lumen (in-stent) stenoses were compared with biplane fluoroscopy of digital angiography. The stent diameter and percent stenosis on all CT images were consistently smaller than measured on digital angiography but were highly correlated (r = 0.97; p < 0.0001) with improvement as stent diameter increased (93% agreement with digital angiography for 4-mm stent, up to 99% for 25-mm stent; p = 0.001). Moderate stenosis could be assessed better than mild stenosis (99% vs 91% agreement with digital angiography; p = 0.003). Increasing exposure settings improved CT correlation of all measur...Continue Reading

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Citations

Jan 10, 2012·La Radiologia medica·T ValenteM Scaglione
Nov 5, 2009·Cardiology in the Young·Anthony M HlavacekGirish S Shirali
Apr 22, 2009·AJR. American Journal of Roentgenology·Jonathan R Dillman, Ramiro J Hernandez
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Jun 16, 2010·Catheterization and Cardiovascular Interventions : Official Journal of the Society for Cardiac Angiography & Interventions·Israel ValverdeThomas Krasemann
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Jan 5, 2010·Korean Journal of Radiology : Official Journal of the Korean Radiological Society·Hyun Woo Goo
Aug 17, 2010·Journal of Thoracic Imaging·Anthony Marcus Hlavacek
Aug 24, 2019·Pediatric Radiology·Aurelio SecinaroPaolo Ciliberti
May 15, 2021·Korean Journal of Radiology : Official Journal of the Korean Radiological Society·Hyun Woo GooDong Man Seo

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