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Proceedings Paper

Quantification of the migration and deformation of abdominal aortic aneurysm stent grafts
Author(s): Julian Mattes; Iris Steingruber; Michael Netzer; Karl Fritscher; Helmut Kopf; Werner Jaschke; Rainer Schubert M.D.
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Paper Abstract

The endovascular repair of an abdominal aortic aneurysm is a minimal invasive therapy which has been established during the past 15 years. A stent-graft is placed inside the aorta in order to cover the weakened regions of its wall. During a time interval of one or more years the stent-graft can migrate and deform with the risk of the occlusion of one of its limbs or of the rupture of the aneurysm. In this work we developed several strategies to quantify the migration and deformation in order to assess the risk coming with these movements and especially to characterize appearing complications by them. We calculated the rigid movement of the stent-graft and the aorta relative to the spinal canal. For this purpose, firstly, we rigidly registered the spinal canals, extracted for the different points in time, in order to establish a fixed reference system. All objects have been segmented first and surface points have been determined before applying a rigid and non-rigid point set registration algorithm. The change in the residual error after registration of the stent-graft with an increasing number of degrees of freedom indicates the amount of change in the stent-graft's morphology. We investigated a sample of 9. Two cases could be clearly distinguished by the quantified parameters: a high global migration and a strong reduction of the residual error after non-rigid registration. In both cases, strong complications have been detected by the examination of clinical experts but only by means of the images acquired one year later.

Paper Details

Date Published: 10 March 2006
PDF: 9 pages
Proc. SPIE 6144, Medical Imaging 2006: Image Processing, 61440V (10 March 2006); doi: 10.1117/12.653990
Show Author Affiliations
Julian Mattes, Univ. for Health Sciences, Medical Informatics and Technology (Austria)
Iris Steingruber, Innsbruck Medical Univ. (Austria)
Michael Netzer, Univ. for Health Sciences, Medical Informatics and Technology (Austria)
Karl Fritscher, Univ. for Health Sciences, Medical Informatics and Technology (Austria)
Helmut Kopf, Innsbruck Medical Univ. (Austria)
Werner Jaschke, Innsbruck Medical Univ. (Austria)
Rainer Schubert M.D., Univ. for Health Sciences, Medical Informatics and Technology (Austria)

Published in SPIE Proceedings Vol. 6144:
Medical Imaging 2006: Image Processing
Joseph M. Reinhardt; Josien P. W. Pluim, Editor(s)

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