Positive contrast visualization of nitinol devices using susceptibility gradient mapping.

Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine
Evert-Jan VonkenMatthias Stuber

Abstract

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.

References

Mar 1, 1997·Journal of Magnetic Resonance Imaging : JMRI·J R ReichenbachE M Haacke
Jan 22, 2000·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·S S VasanawalaD G Nishimura
Oct 3, 2003·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Jan-Henry SeppenwooldeChris J G Bakker
Apr 6, 2004·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Michael SchärPeter Boesiger
Apr 22, 2005·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Charles H CunninghamSteven M Conolly
Dec 13, 2005·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Chris J G BakkerKoen L Vincken
Oct 31, 2007·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Matthias StuberDara L Kraitchman

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Citations

May 19, 2009·Magma·Sunil PatilKlaus Scheffler
Jun 10, 2010·Investigative Radiology·Nils A KrämerGabriele A Krombach
Mar 13, 2012·Magnetic Resonance Imaging·Chris J G BakkerPeter R Seevinck
Jan 3, 2013·Journal of Magnetic Resonance Imaging : JMRI·Evert-jan P A VonkenMatthias Stuber
Mar 22, 2012·Contrast Media & Molecular Imaging·M WoltersW H Backes
Aug 27, 2010·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Peter R SeevinckChris J G Bakker
Apr 19, 2011·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Gopal VarmaTobias Schaeffter
Sep 28, 2018·Physics in Medicine and Biology·Evan McNabbMichael D Noseworthy

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