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arXiv:1102.2646 (physics)
[Submitted on 14 Feb 2011]

Title:Active split-ring metamaterial slabs for magnetic resonance imaging

Authors:Marcos A. Lopez, Jose M. Algarin, Manuel J. Freire, Volker C. Behr, Peter M. Jakob, Ricardo Marques
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Abstract:In this work, it is analyzed the ability of split-ring metamaterial slabs with zero/high permeability to reject/confine the radiofrequency magnetic field in magnetic resonance imaging systems. Using an homogenization procedure, split-ring slabs have been designed and fabricated to work in a 1.5T system. Active elements consisting of pairs of crossed diodes are inserted in the split-rings. With these elements, the permeability of the slabs can be automatically switched between a unity value when interacting with the strong excitation field of the transmitting body coil, and zero or high values when interacting with the weak field produced by protons in tissue. Experiments are shown for different configurations where these slabs can help to locally increase the signal-to-noise-ratio.
Comments: 6 pages, 4 figures
Subjects: Medical Physics (physics.med-ph)
Cite as: arXiv:1102.2646 [physics.med-ph]
  (or arXiv:1102.2646v1 [physics.med-ph] for this version)
  https://doi.org/10.48550/arXiv.1102.2646
Related DOI: https://doi.org/10.1063/1.3574916

Submission history

From: Manuel Freire [view email]
[v1] Mon, 14 Feb 2011 00:06:19 UTC (404 KB)
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