Positive contrast visualization of nitinol devices using susceptibility gradient mapping

Evert Jan P.A. Vonken, Michael Schär, Matthias Stuber

Research output: Contribution to journalArticlepeer-review

Abstract

MRI visualization of devices is traditionally based on signal loss due to T2* 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.

Original languageEnglish (US)
Pages (from-to)588-594
Number of pages7
JournalMagnetic resonance in medicine
Volume60
Issue number3
DOIs
StatePublished - Sep 2008

Keywords

  • Device
  • Positive contrast
  • Post-processing
  • Susceptibility
  • Visualization

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging

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