Development of an Image-Based Modeling System to Investigate Evolutional Geometric Changes of a Stent Graft in an Abdominal Aortic Aneurysm

Masaharu Kobayashi; Katsuyuki Hoshina; Sota Yamamoto; Youkou Nemoto; Takafumi Akai; Kunihiro Shigematsu; Toshiaki Watanabe; Marie Ohshima

doi:10.1253/circj.CJ-15-0037

Circulation Journal

Online ISSN : 1347-4820
Print ISSN : 1346-9843
ISSN-L : 1346-9843

Imaging

Development of an Image-Based Modeling System to Investigate Evolutional Geometric Changes of a Stent Graft in an Abdominal Aortic Aneurysm

Masaharu Kobayashi, Katsuyuki Hoshina, Sota Yamamoto, Youkou Nemoto, Takafumi Akai, Kunihiro Shigematsu, Toshiaki Watanabe, Marie Ohshima

Author information

Masaharu Kobayashi
Interfaculty Initiative in Information Studies/Institute of Industrial Science, The University of Tokyo
Katsuyuki Hoshina
Division of Vascular Surgery, Department of Surgery, Graduate School of Medicine, The University of Tokyo
Sota Yamamoto
Department of Mechanical Engineering, Graduate School, Shibaura Institute of Technology
Youkou Nemoto
Division of Vascular Surgery, Department of Surgery, Graduate School of Medicine, The University of Tokyo
Takafumi Akai
Division of Vascular Surgery, Department of Surgery, Graduate School of Medicine, The University of Tokyo
Kunihiro Shigematsu
Division of Vascular Surgery, Department of Surgery, Graduate School of Medicine, The University of Tokyo
Toshiaki Watanabe
Division of Vascular Surgery, Department of Surgery, Graduate School of Medicine, The University of Tokyo
Marie Ohshima
Interfaculty Initiative in Information Studies/Institute of Industrial Science, The University of Tokyo

Corresponding author

ORCID

Keywords: Aortic aneurysm, Modeling system, Stent graft

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2015 Volume 79 Issue 7 Pages 1534-1541

DOI https://doi.org/10.1253/circj.CJ-15-0037

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Published: June 25, 2015 Received: January 13, 2015 Released on J-STAGE: June 25, 2015 Accepted: February 20, 2015 Advance online publication: March 25, 2015 Revised: February 12, 2015

Abstract

Background:Quantification of geometric changes of the stent graft (SG) in abdominal aortic aneurysm has been required for follow up of endovascular aneurysm repair (EVAR). The aim was to develop an image-based modeling system (V-Modeler) to investigate these changes over time.Methods and Results:V-Modeler was applied to investigate the migration of the SG. Three sets of computed tomography images were taken at 3 different times: (1) 5 days after the implantation; (2) 7 months later when the unilateral leg migrated upward; and (3) 10 months later when the limb had migrated into the common iliac aneurysm resulting in a type 1b endoleak. A spline function was used to represent the center lines of the SG to track its evolutional geometric changes in a three-dimensional manner. The characteristics of vascular geometry, as well as the SG geometry using geometric parameters such as length, curvature, torsion, angle of tangent vector (ATV), and migrated length, was evaluated. It was observed that the strong peak of the curvature in the distal area appeared, and a conversion of the torsion disappeared chronologically.Conclusions:The V-Modeler was developed, which not only can extract vascular geometry but also can identify geometric parameter, such as curvature, torsion, and ATV, to predict adverse events following EVAR. (Circ J 2015; 79: 1534–1541)

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