Coronary Ct Angiography On Revascularized Patients : Coronary Stenting

2052 Words Jul 27th, 2016 9 Pages
Coronary CT angiography on revascularized patients: coronary stenting
Recently, coronary CT angiography has been increasingly used for assessment of coronary stent patency or restenosis. However, imaging of coronary stents by multislice CT is more difficult than imaging of a native coronary artery. This is because of the presence of metal within the stents which can cause artifacts interfering with the interpretation of lumen patency. While the accuracy of stent lumen analysis was low or modest with 4- and 16-slice CT scanners, 64-slice CT (single-source and dual-source) scanners allow for more accurate stent visualization and characterization owing to increased spatial and temporal resolution. Recent meta-analyses of the diagnostic value of CCTA in coronary stenting showed that the diagnostic value of 64-slice CT angiography is significantly higher than that of 16-slice CT angiography (91 vs 81%) as a result of the increased spatial and temporal resolution. Stent diameter and beam hardening artifacts are two common factors that affect the visualization of coronary stents or in-stent restenosis. Thus, the inclusion of coronary stents of >3.0 mm and the use of dedicated edge-enhancing convolution kernels improve the diagnostic accuracy of CCTA in the follow-up of coronary stenting (Sun et al, 2012).
In our study, we could evaluate the patency of the stents of various patients by indirect signs of patency (opacification of the vessels distal to the stent).
In-stent restenosis…
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