Microfocal X-ray computed tomography post-processing operations for optimizing reconstruction volumes of stented arteries during 3D computational fluid dynamics modeling

Restenosis caused by neointimal hyperplasia (NH) remains an important clinical problem after stent implantation. Restenosis varies with stent geometry, and idealized computational fluid dynamics (CFD) models have indicated that geometric properties of the implanted stent may differentially influence...

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Bibliographic Details
Published in:Computer methods and programs in biomedicine Vol. 79; no. 2; pp. 121 - 134
Main Authors: LaDisa, John F., Olson, Lars E., Ropella, Kristina M., Molthen, Robert C., Haworth, Steven T., Kersten, Judy R., Warltier, David C., Pagel, Paul S.
Format: Journal Article
Language:English
Published: Ireland Elsevier Ireland Ltd 01.08.2005
Subjects:
Angiography - methods
Animals
Computer Simulation
Iliac Artery - diagnostic imaging
Neointimal hyperplasia
Rabbits
Restenosis
Stent
Stents
Tomography, X-Ray Computed - methods
Restenosis
Neointimal hyperplasia
Stent
ISSN:0169-2607, 1872-7565
Online Access:Get full text
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Summary:Restenosis caused by neointimal hyperplasia (NH) remains an important clinical problem after stent implantation. Restenosis varies with stent geometry, and idealized computational fluid dynamics (CFD) models have indicated that geometric properties of the implanted stent may differentially influence NH. However, 3D studies capturing the in vivo flow domain within stented vessels have not been conducted at a resolution sufficient to detect subtle alterations in vascular geometry caused by the stent and the subsequent temporal development of NH. We present the details and limitations of a series of post-processing operations used in conjunction with microfocal X-ray CT imaging and reconstruction to generate geometrically accurate flow domains within the localized region of a stent several weeks after implantation. Microfocal X-ray CT reconstruction volumes were subjected to an automated program to perform arterial thresholding, spatial orientation, and surface smoothing of stented and unstented rabbit iliac arteries several weeks after antegrade implantation. A transfer function was obtained for the current post-processing methodology containing reconstructed 16 mm stents implanted into rabbit iliac arteries for up to 21 days after implantation and resolved at circumferential and axial resolutions of 32 and 50 μm, respectively. The results indicate that the techniques presented are sufficient to resolve distributions of WSS with 80% accuracy in segments containing 16 surface perturbations over a 16 mm stented region. These methods will be used to test the hypothesis that reductions in normalized wall shear stress (WSS) and increases in the spatial disparity of WSS immediately after stent implantation may spatially correlate with the temporal development of NH within the stented region.
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ISSN:0169-2607
1872-7565
DOI:10.1016/j.cmpb.2005.03.005