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01-10-2012 | Vascular-Interventional

Haemodynamic imaging of thoracic stent-grafts by computational fluid dynamics (CFD): presentation of a patient-specific method combining magnetic resonance imaging and numerical simulations

Authors: Marco Midulla, Ramiro Moreno, Adil Baali, Ming Chau, Anne Negre-Salvayre, Franck Nicoud, Jean-Pierre Pruvo, Stephan Haulon, Hervé Rousseau

Published in: European Radiology | Issue 10/2012

Abstract

Objectives

In the last decade, there was been increasing interest in finding imaging techniques able to provide a functional vascular imaging of the thoracic aorta. The purpose of this paper is to present an imaging method combining magnetic resonance imaging (MRI) and computational fluid dynamics (CFD) to obtain a patient-specific haemodynamic analysis of patients treated by thoracic endovascular aortic repair (TEVAR).

Methods

MRI was used to obtain boundary conditions. MR angiography (MRA) was followed by cardiac-gated cine sequences which covered the whole thoracic aorta. Phase contrast imaging provided the inlet and outlet profiles. A CFD mesh generator was used to model the arterial morphology, and wall movements were imposed according to the cine imaging. CFD runs were processed using the finite volume (FV) method assuming blood as a homogeneous Newtonian fluid.

Results

Twenty patients (14 men; mean age 62.2 years) with different aortic lesions were evaluated. Four-dimensional mapping of velocity and wall shear stress were obtained, depicting different patterns of flow (laminar, turbulent, stenosis-like) and local alterations of parietal stress in-stent and along the native aorta.

Conclusions

A computational method using a combined approach with MRI appears feasible and seems promising to provide detailed functional analysis of thoracic aorta after stent-graft implantation.

Key Points

• Functional vascular imaging of the thoracic aorta offers new diagnostic opportunities

• CFD can model vascular haemodynamics for clinical aortic problems

• Combining CFD with MRI offers patient specific method of aortic analysis

• Haemodynamic analysis of stent-grafts could improve clinical management and follow-up.

Available only for authorised users

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Title: Haemodynamic imaging of thoracic stent-grafts by computational fluid dynamics (CFD): presentation of a patient-specific method combining magnetic resonance imaging and numerical simulations
Authors: Marco Midulla
Ramiro Moreno
Adil Baali
Ming Chau
Anne Negre-Salvayre
Franck Nicoud
Jean-Pierre Pruvo
Stephan Haulon
Hervé Rousseau
Publication date: 01-10-2012
Publisher: Springer-Verlag
Published in: European Radiology / Issue 10/2012
Print ISSN: 0938-7994
Electronic ISSN: 1432-1084
DOI: https://doi.org/10.1007/s00330-012-2465-7

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Springer Medicine

Haemodynamic imaging of thoracic stent-grafts by computational fluid dynamics (CFD): presentation of a patient-specific method combining magnetic resonance imaging and numerical simulations

Abstract

Objectives

Methods

Results

Conclusions

Key Points

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Abstract

Objectives

Methods

Results

Conclusions

Key Points

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