In vivo evaluation of carotid artery stents using multi-detector-row computed tomography angiography: comparison of 3
Youn Joo Lee1, Yeon Soo Lim, Na Young Jung
1Department of Radiology, Bucheon St Mary's Hospital, College of Medicine, The Catholic University of Korea, Republic of Korea.
Objective:
The objective of this study was to assess the lumen visibility of carotid artery stents using multi-detector-row computed tomography (MDCT) angiography; compare medium-smooth, medium-sharp, and sharp kernels; and correlate these results to those of digital subtraction angiography (DSA).
Methods:
We retrospectively evaluated 52 stents from 51 patients who underwent 16- and 64-slice MDCT angiography. Lumen diameters were measured 3 times by 2 neuroradiologists, and artificial luminal narrowing was calculated. To assess detection of in-stent restenosis (>50%), 2 neuroradiologists evaluated all MDCT and DSA images.
Results:
Excellent intraobserver and interobserver agreements were obtained for the lumen diameter measurements (P < 0.001). Lumen diameter visibility improved, and artificial luminal narrowing decreased from the medium-smooth kernel to the sharp kernel. Visual estimation of all CT angiography using the 3 kernels showed high accuracy for detection of in-stent restenosis (>50%), compared with DSA.
Conclusions:
Computed tomography angiography using a sharp kernel allows for more accurate assessment of lumen visibility after carotid artery stenting.
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