Computation of Wall Stress in Abdominal Aortic Aneurysms

    Research output: Contribution to conferenceAbstract

    Abstract

    An abdominal aortic aneurysm (AAA) is a permanent and irreversible dilation of the lower region of the aorta. It is a symptomless condition that, if left untreated, can expand to the point of rupture. Mechanically-speaking, rupture of an artery occurs when the local wall stress exceeds the local wall strength. It is therefore desirable to be able to estimate the patient-specific AAA wall stress non-invasively, quickly and reliably.
    The stress in the AAA wall is induced by the blood pressure. Many authors have proposed to use the finite element method to compute the wall stress, based on the recorded blood pressure and AAA geometry extracted from medical images. One fact disregarded by most proposed methods is that the geometry extracted from images is not the “stress-free” un-deformed geometry, but the deformed geometry under the influence of blood pressure. Therefore we consider that an inverse solution method is more appropriate, with the wall stress being computed based on the deformed geometry and the measured blood pressure. We show that in this approach material properties have very little influence on the computed stresses, and develop a simplified method for AAA wall stress computation applicable in the clinic.
    Original languageEnglish
    Publication statusPublished - 2015
    Event2nd Australasian Conference on Computational Mechanics (ACCM2015) - Brisbane, Australia
    Duration: 30 Nov 20151 Dec 2015

    Conference

    Conference2nd Australasian Conference on Computational Mechanics (ACCM2015)
    CountryAustralia
    CityBrisbane
    Period30/11/151/12/15

    Fingerprint

    Blood pressure
    Geometry
    Materials properties
    Finite element method

    Cite this

    Joldes, G. R., Miller, K., Wittek, A., & Doyle, B. (2015). Computation of Wall Stress in Abdominal Aortic Aneurysms. Abstract from 2nd Australasian Conference on Computational Mechanics (ACCM2015), Brisbane, Australia.
    Joldes, Grand R. ; Miller, Karol ; Wittek, Adam ; Doyle, Barry. / Computation of Wall Stress in Abdominal Aortic Aneurysms. Abstract from 2nd Australasian Conference on Computational Mechanics (ACCM2015), Brisbane, Australia.
    @conference{767f96704cc04f1590f0fb14e51aa080,
    title = "Computation of Wall Stress in Abdominal Aortic Aneurysms",
    abstract = "An abdominal aortic aneurysm (AAA) is a permanent and irreversible dilation of the lower region of the aorta. It is a symptomless condition that, if left untreated, can expand to the point of rupture. Mechanically-speaking, rupture of an artery occurs when the local wall stress exceeds the local wall strength. It is therefore desirable to be able to estimate the patient-specific AAA wall stress non-invasively, quickly and reliably.The stress in the AAA wall is induced by the blood pressure. Many authors have proposed to use the finite element method to compute the wall stress, based on the recorded blood pressure and AAA geometry extracted from medical images. One fact disregarded by most proposed methods is that the geometry extracted from images is not the “stress-free” un-deformed geometry, but the deformed geometry under the influence of blood pressure. Therefore we consider that an inverse solution method is more appropriate, with the wall stress being computed based on the deformed geometry and the measured blood pressure. We show that in this approach material properties have very little influence on the computed stresses, and develop a simplified method for AAA wall stress computation applicable in the clinic.",
    author = "Joldes, {Grand R.} and Karol Miller and Adam Wittek and Barry Doyle",
    year = "2015",
    language = "English",
    note = "2nd Australasian Conference on Computational Mechanics (ACCM2015) ; Conference date: 30-11-2015 Through 01-12-2015",

    }

    Joldes, GR, Miller, K, Wittek, A & Doyle, B 2015, 'Computation of Wall Stress in Abdominal Aortic Aneurysms' 2nd Australasian Conference on Computational Mechanics (ACCM2015), Brisbane, Australia, 30/11/15 - 1/12/15, .

    Computation of Wall Stress in Abdominal Aortic Aneurysms. / Joldes, Grand R.; Miller, Karol ; Wittek, Adam; Doyle, Barry.

    2015. Abstract from 2nd Australasian Conference on Computational Mechanics (ACCM2015), Brisbane, Australia.

    Research output: Contribution to conferenceAbstract

    TY - CONF

    T1 - Computation of Wall Stress in Abdominal Aortic Aneurysms

    AU - Joldes, Grand R.

    AU - Miller, Karol

    AU - Wittek, Adam

    AU - Doyle, Barry

    PY - 2015

    Y1 - 2015

    N2 - An abdominal aortic aneurysm (AAA) is a permanent and irreversible dilation of the lower region of the aorta. It is a symptomless condition that, if left untreated, can expand to the point of rupture. Mechanically-speaking, rupture of an artery occurs when the local wall stress exceeds the local wall strength. It is therefore desirable to be able to estimate the patient-specific AAA wall stress non-invasively, quickly and reliably.The stress in the AAA wall is induced by the blood pressure. Many authors have proposed to use the finite element method to compute the wall stress, based on the recorded blood pressure and AAA geometry extracted from medical images. One fact disregarded by most proposed methods is that the geometry extracted from images is not the “stress-free” un-deformed geometry, but the deformed geometry under the influence of blood pressure. Therefore we consider that an inverse solution method is more appropriate, with the wall stress being computed based on the deformed geometry and the measured blood pressure. We show that in this approach material properties have very little influence on the computed stresses, and develop a simplified method for AAA wall stress computation applicable in the clinic.

    AB - An abdominal aortic aneurysm (AAA) is a permanent and irreversible dilation of the lower region of the aorta. It is a symptomless condition that, if left untreated, can expand to the point of rupture. Mechanically-speaking, rupture of an artery occurs when the local wall stress exceeds the local wall strength. It is therefore desirable to be able to estimate the patient-specific AAA wall stress non-invasively, quickly and reliably.The stress in the AAA wall is induced by the blood pressure. Many authors have proposed to use the finite element method to compute the wall stress, based on the recorded blood pressure and AAA geometry extracted from medical images. One fact disregarded by most proposed methods is that the geometry extracted from images is not the “stress-free” un-deformed geometry, but the deformed geometry under the influence of blood pressure. Therefore we consider that an inverse solution method is more appropriate, with the wall stress being computed based on the deformed geometry and the measured blood pressure. We show that in this approach material properties have very little influence on the computed stresses, and develop a simplified method for AAA wall stress computation applicable in the clinic.

    M3 - Abstract

    ER -

    Joldes GR, Miller K, Wittek A, Doyle B. Computation of Wall Stress in Abdominal Aortic Aneurysms. 2015. Abstract from 2nd Australasian Conference on Computational Mechanics (ACCM2015), Brisbane, Australia.