Abstract
In patients in whom a revascularization is performed because of significant coronary artery disease, PCI with stent placement remains the preferred method of revascularization. Visualization of the stent lumen in coronary CT angiography (CCTA) is possible, but dependent on both the stent used in a specific patient as well as on the selection of imaging parameters. CCTA is able to delineate the stent lumen in large stents (>3.0 mm) placed in the proximal coronary arteries. Also thin stent struts (<100µm) and stents made from alloys such as nitinolor cobalt-chromium facilitate the delineation of the stent lumen. On the imaging side, sufficient enhancement of the coronary vessel is a prerequisite for visualization of the stent lumen. Also choice of the appropriate reconstruction technique is of great importance for the visualization of the lumen. Iterative reconstruction techniques with edge enhancing algorithms have been shown to yield best results for stent imaging. Recently it has been shown, that monochromatic imaging with photon energies around 80keV also seems to facilitate the diagnosis of stent stenosis. In patients selected for bypass surgery, CCTA has been shown to yield a high sensitivity and specificity for the detection of graft stenosis and occlusions. The distal anastomosis of the graft to the coronary artery is difficult to evaluate due to the small diameter of the lumen and because of artifacts caused by vascular clips used to close branch vessels.
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Seifarth, H., Maintz, D. (2018). Pre- and Postinterventional/Surgical Evaluation by CT. In: Nikolaou, K., Bamberg, F., Laghi, A., Rubin, G.D. (eds) Multislice CT. Medical Radiology(). Springer, Cham. https://doi.org/10.1007/174_2017_158
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DOI: https://doi.org/10.1007/174_2017_158
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