Neck CTA with Deformable Registration and Subtraction Method: Evaluation in Patients with Stents
|Masahiro Higashi1*, Suzu Kanzaki1, Yoshitaka Onishi1, Mutsumi Adachi1, Naomi Morita1, Yoshiaki Morita1, Tetsuya Fukuda1, Naoaki Yamada1, Tetsu Satow2 and Hiroaki Naito1|
|1Department of Radiology, National Cerebral and Cardiovascular Center, Japan|
|2Department of Neurosurgery, National Cerebral and Cardiovascular Center, Japan|
|Corresponding Author :||Masahiro Higashi
Chief of CT Division, Department of Radiology
National Cerebral and Cardiovascular Center, Japan
E-mail: [email protected]
|Received August 08, 2014; Accepted September 11, 2014; Published September 18, 2014|
|Citation: Higashi M, Kanzaki S, Onishi Y, Adachi M, Morita N, et al. (2014) Neck CTA with Deformable Registration and Subtraction Method: Evaluation in Patients with Stents. OMICS J Radiol 3:169. doi:10.4172/2167-7964.1000169|
|Copyright: © 2014 Higashi M, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.|
Background and purpose: The evaluation of arterial lumen with severe calcification or stent is still challenging. The purpose of the present study was to assess the effectiveness of the new subtraction method for CTA in patients with carotid artery stents.
Materials and methods: A total of 35 consecutive neck CTA examinations in patients who had undergone carotid artery stent placement were selected for inclusion in this retrospective study. The CT scanner used was a 320-row MDCT system. The new subtraction method (global non-rigid registration and local rigid refinement subtraction) was used to obtain subtraction images. Two observers visually assessed the subtraction effect for the stents and for bone near the vertebral arteries using a 4-grade scale in order to compare the new subtraction method against the conventional subtraction method and DSA.
Results: The arterial lumen could be evaluated in 89% of the stent subtraction images and 100% of the bone subtraction images obtained using the new subtraction method, and the subtraction images were judged to be superior to those obtained using the conventional method. The stenosis ratios showed a high correlation with those obtained by DSA (r = 0.92).
Conclusion: The new subtraction method is effective in eliminating stents and bones and is also useful for assessing the arterial lumen after stent placement.