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Automatic aortic valve landmark localization in coronary CT angiography using colonial walk

Authors
 Walid Abdullah Al  ;  Ho Yub Jung  ;  Il Dong Yun  ;  Yeonggul Jang  ;  Hyung-Bok Park  ;  Hyuk-Jae Chang 
Citation
 PLOS ONE, Vol.13(7) : e0200317, 2018 
Journal Title
PLOS ONE
Issue Date
2018
MeSH
Anatomic Landmarks/anatomy & histology ; Anatomic Landmarks/diagnostic imaging* ; Aortic Valve/anatomy & histology ; Aortic Valve/diagnostic imaging* ; Computed Tomography Angiography/methods* ; Humans ; Male ; Middle Aged ; Radiography, Interventional/methods ; Transcatheter Aortic Valve Replacement/methods*
Abstract
The minimally invasive transcatheter aortic valve implantation (TAVI) is the most prevalent method to treat aortic valve stenosis. For pre-operative surgical planning, contrast-enhanced coronary CT angiography (CCTA) is used as the imaging technique to acquire 3-D measurements of the valve. Accurate localization of the eight aortic valve landmarks in CT images plays a vital role in the TAVI workflow because a small error risks blocking the coronary circulation. In order to examine the valve and mark the landmarks, physicians prefer a view parallel to the hinge plane, instead of using the conventional axial, coronal or sagittal view. However, customizing the view is a difficult and time-consuming task because of unclear aorta pose and different artifacts of CCTA. Therefore, automatic localization of landmarks can serve as a useful guide to the physicians customizing the viewpoint. In this paper, we present an automatic method to localize the aortic valve landmarks using colonial walk, a regression tree-based machine-learning algorithm. For efficient learning from the training set, we propose a two-phase optimized search space learning model in which a representative point inside the valvular area is first learned from the whole CT volume. All eight landmarks are then learned from a smaller area around that point. Experiment with preprocedural CCTA images of TAVI undergoing patients showed that our method is robust under high stenotic variation and notably efficient, as it requires only 12 milliseconds to localize all eight landmarks, as tested on a 3.60 GHz single-core CPU.
Files in This Item:
T201804695.pdf.pdf Download
DOI
10.1371/journal.pone.0200317
Appears in Collections:
1. College of Medicine (의과대학) > Dept. of Internal Medicine (내과학교실) > 1. Journal Papers
Yonsei Authors
Chang, Hyuk-Jae(장혁재) ORCID logo https://orcid.org/0000-0002-6139-7545
URI
https://ir.ymlib.yonsei.ac.kr/handle/22282913/166790
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