Positive contrast visualization of nitinol devices using susceptibility gradient mapping.

Détails

ID Serval
serval:BIB_3B66AE71D7FE
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Institution
Titre
Positive contrast visualization of nitinol devices using susceptibility gradient mapping.
Périodique
Magnetic Resonance In Medicine
Auteur(s)
Vonken E.J., Schär M., Stuber M.
ISSN
1522-2594[electronic], 0740-3194[linking]
Statut éditorial
Publié
Date de publication
2008
Volume
60
Numéro
3
Pages
588-594
Langue
anglais
Notes
Publication types: Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't
Publication Status: ppublish
Résumé
MRI visualization of devices is traditionally based on signal loss due to T(2)* effects originating from local susceptibility differences. To visualize nitinol devices with positive contrast, a recently introduced postprocessing method is adapted to map the induced susceptibility gradients. This method operates on regular gradient-echo MR images and maps the shift in k-space in a (small) neighborhood of every voxel by Fourier analysis followed by a center-of-mass calculation. The quantitative map of the local shifts generates the positive contrast image of the devices, while areas without susceptibility gradients render a background with noise only. The positive signal response of this method depends only on the choice of the voxel neighborhood size. The properties of the method are explained and the visualizations of a nitinol wire and two stents are shown for illustration.
Mots-clé
Alloys, Contrast Media/analysis, Fourier Analysis, Magnetic Resonance Imaging/methods, Phantoms, Imaging, Stents
Pubmed
Web of science
Création de la notice
02/03/2010 17:04
Dernière modification de la notice
20/08/2019 14:31
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