MR image-based geometric and hemodynamic investigation of the right coronary artery with dynamic vessel motion

Ryo Torii*, Jennifer Keegan, Nigel B. Wood, Andrew W. Dowsey, Alun D. Hughes, Guang Zhong Yang, David N. Firmin, Simon A Mcg Thom, X. Yun Xu

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

26 Citations (Scopus)

Abstract

The aim of this study was to develop a fully subjectspecific model of the right coronary artery (RCA), including dynamic vessel motion, for computational analysis to assess the effects of cardiac-induced motion on hemodynamics and resulting wall shear stress (WSS). Vascular geometries were acquired in the right coronary artery (RCA) of a healthy volunteer using a navigator-gated interleaved spiral sequence at 14 time points during the cardiac cycle. A high temporal resolution velocity waveform was also acquired in the proximal region. Cardiac-induced dynamic vessel motion was calculated by interpolating the geometries with an active contour model and a computational fluid dynamic (CFD) simulation with fully subject-specific information was carried out using this model. The results showed the expected variation of vessel radius and curvature throughout the cardiac cycle, and also revealed that dynamic motion of the right coronary artery consequent to cardiac motion had significant effects on instantaneous WSS and oscillatory shear index. Subjectspecific MRI-based CFD is feasible and, if scan duration could be shortened, this method may have potential as a noninvasive tool to investigate the physiological and pathological role of hemodynamics in human coronary arteries.

Original languageEnglish
Pages (from-to)2606-2620
Number of pages15
JournalAnnals of Biomedical Engineering
Volume38
Issue number8
DOIs
Publication statusPublished - Aug 2010

Keywords

  • Computational fluid dynamics
  • Coronary artery
  • Dynamic vessel motion
  • Magnetic resonance imaging

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