A Segmentation Method for Stentgrafts in the Abdominal Aorta from ECG-gated CTA Data

Almar Klein, W.K.J. Renema, L.J. Oostveen, L.J. Schultze Kool, Cornelis H. Slump

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

    6 Citations (Scopus)
    25 Downloads (Pure)

    Abstract

    Endovascular aortic replacement (EVAR) is an established technique, which uses stentgrafts to treat aortic aneurysms in patients at risk of aneurysm rupture. The long-term durability of a stentgraft is affected by the stresses and hemodynamic forces applied to it, and may be reflected by the movements of the stentgraft itself during the cardiac cycle. A conventional CT scan (which results in a 3D volume) is not able to visualize these movements. However, applying ECG-gating does provide insight in the motion of the stentgraft caused by hemodynamic forces at different phases of the cardiac cycle. The amount of data obtained is a factor of ten larger compared to conventional CT, but the radiation dose is kept similar for patient safety. This causes the data to be noisy, and streak artifacts are more common. Algorithms for automatic stentgraft detection must be able to cope with this. Segmentation of the stentgraft is performed by examining slices perpendicular to the centreline. Regions with high CT-values exist at the locations where the metallic frame penetrates the slice. These regions are well suited for detection and sub-pixel localization. Spurious points can be removed by means of a clustering algorithm, leaving only points on the contour of the stent. We compare the performance of several different point detection methods and clustering algorithms. The position of the stent’s centreline is calculated by fitting a circle through these points. The proposed method can detect several stentgraft types, and is robust against noise and streak artifacts.
    Original languageUndefined
    Title of host publicationProceedings of SPIE Medical Imaging 2008
    EditorsX.P. Hu, A.V. Clough
    Place of PublicationBellingham, Washington
    PublisherSPIE
    Pages6916
    Number of pages10
    ISBN (Print)9780819471000
    DOIs
    Publication statusPublished - 12 Mar 2008
    EventSPIE Medical Imaging 2008 - Town & Country Resort and Convention Center, San Diego, United States
    Duration: 16 Feb 200821 Feb 2008

    Publication series

    NameProceedings of SPIE
    PublisherSPIE
    Number69160R
    Volume6916

    Conference

    ConferenceSPIE Medical Imaging 2008
    CountryUnited States
    CitySan Diego
    Period16/02/0821/02/08

    Keywords

    • EWI-12134
    • IR-62225
    • METIS-250916

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