Imaging of coronary artery stents using multislice computed tomography: in vitro evaluation |
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Authors: | Maintz David Juergens Kai-Uwe Wichter Thomas Grude Matthias Heindel Walter Fischbach Roman |
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Institution: | (1) Department of Clinical Radiology, University of Münster, Albert-Schweitzer-Strasse 33, 48129 Münster, Germany,;(2) Department of Cardiology and Angiology, University of Münster, Albert-Schweitzer-Strasse 33; 48129 Münster, Germany, |
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Abstract: | The aim of this study was to evaluate imaging features of different coronary artery stents during multislice CT Angiography
(MSCTA). Nineteen stents made of varying material (steel, nitinol, tantalum) and of varying stent design were implanted in
plastic tubes with an inner diameter of 3 mm to simulate a coronary artery. The tubes were filled with iodinated contrast
material diluted to 200 Hounsfield units (HU), closed at both ends and positioned in a plastic container filled with oil (–70 HU).
The MSCT scans were obtained perpendicular to the stent axes (detector collimation 4×1 mm, table feed 2 mm/rotation, 300 mAs,
120 kV). Axial images and multiplanar reformations were evaluated regarding artifact size, lumen visibility, and intraluminal
attenuation values. Artifacts characterized by artifactual thickening of the stent struts leading to apparent reduction in
the lumen diameter and increased intraluminal attenuation values were observed in all cases. The stent lumen was totally obscured
in the Wiktor stent, the Wallgraft stent, and the Nir Royal stent. Partial residual of the stent lumen could be visualized
in all other utilized stent products (artificial lumen reductions ranged from 62% in the V-Flex stent to 94% in the Bx Velocity
stent). Parts of the stent lumen can be visualized in most coronary artery stents; however, detectability of in-stent stenoses
remains to be evaluated for each stent type.
Electronic Publication |
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Keywords: | Stents Multislice CT CT angiography Coronary angiography Artifacts |
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