Local influence of calcifications on the wall mechanics of abdominal aortic aneurysm

Sander De Putter, Frans N. Van De Vosse, Marcel Breeuwer, Frans A. Gerritsen

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

5 Citations (Scopus)

Abstract

Finite element wall stress simulations on patient-specific models of abdominal aortic aneurysm (AAA) may provide a better rupture risk predictor than the currently used maximum transverse diameter. Calcifications in the wall of AAA lead to a higher maximum wall stress and thus may lead to an elevated rupture risk. The reported material, properties for calcifications and the material properties actually used for simulations show great variation. Previous studies have focussed on simplified modelling of the calcification shapes within a realistic aneurysm shape. In this study we use an accurate representation of the calcification geometry and a simplified model for the AAA. The objective of this approach is to investigate the influence of the calcification geometry, the material properties and the modelling approach for the computed peak wall stress. For four realistic calcification shapes from standard clinical CT images of AAA, we performed simulations with three distinct modelling approaches, at five distinct elasticity settings. The results show how peak wall stress is sensitive to the material properties of the calcifications. For relatively elastic calcifications, the results from the different modelling approaches agree. Also, for relatively elastic calcifications the computed wall stress in the tissue surrounding the calcifications shows to be insensitive to the exact calcification geometry. For suffer calcifications the different modelling approaches and the different geometries lead to significantly different results. We conclude that an important challenge for future research is accurately estimating the material properties and the rupture potential of the AAA wall including calcifications.

Original languageEnglish
Title of host publicationMedical Imaging 2006
Subtitle of host publicationPhysiology, Function, and Structure from Medical Images
Place of PublicationBellingham
PublisherSPIE
Number of pages11
ISBN (Print)0819461865, 9780819461865
DOIs
Publication statusPublished - 30 Jun 2006
EventMedical Imaging 2006: Physiology, Function, and Structure from Medical Images - San Diego, CA, United States
Duration: 12 Feb 200614 Feb 2006

Publication series

NameProceedings of SPIE
Volume6143
ISSN (Print)0277-786X

Conference

ConferenceMedical Imaging 2006: Physiology, Function, and Structure from Medical Images
CountryUnited States
CitySan Diego, CA
Period12/02/0614/02/06

Keywords

  • Abdominal aortic aneurysm
  • Calcification
  • Finite element method
  • Sensitivity analysis
  • Wall stress

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