Patch-Probe Excitation for Ultrahigh Magnetic Field Wide-Bore MRI

Patrick Bluem, Andrew Kiruluta, Pierre-Francois Van de Moortele, Allison Duh, Gregor Adriany, Zoya Popovic

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

In this paper, we present the design of probe excitations for 7- and 10.5-T traveling-wave wide-bore magnetic resonance imaging systems. The probes are 297- and 447-MHz coaxially fed microstrip patches, designed to give a circularly polarized magnetic field when placed in the metallic bore waveguide. Images of a water phantom using the patch probes are obtained and compared with full-wave electromagnetic simulations. Additionally, periodic axial metal strip cylinders are inserted into the bore, resulting in improved field uniformity in a phantom with a simultaneous increase in SNR. The numerical analysis for nonquasi-static fields can be computationally intensive, and the numerical error for finite-element simulations is quantified using modified boundary conditions of the system. When the waveguide effects are taken into account, the mode content in the images compares well to full-wave simulations.

Original languageEnglish (US)
Article number7855781
Pages (from-to)2547-2557
Number of pages11
JournalIEEE Transactions on Microwave Theory and Techniques
Volume65
Issue number7
DOIs
StatePublished - Jul 1 2017

Fingerprint

Magnetic resonance imaging
Magnetic fields
cavities
probes
Waveguides
magnetic fields
metal strips
excitation
Strip metal
waveguides
simulation
Magnetic resonance
traveling waves
Imaging systems
Electromagnetic waves
numerical analysis
magnetic resonance
Numerical analysis
electromagnetic radiation
Boundary conditions

Keywords

  • FEM
  • magnetic resonance imaging (MRI)
  • patch antenna
  • waveguide

Cite this

Patch-Probe Excitation for Ultrahigh Magnetic Field Wide-Bore MRI. / Bluem, Patrick; Kiruluta, Andrew; Van de Moortele, Pierre-Francois; Duh, Allison; Adriany, Gregor; Popovic, Zoya.

In: IEEE Transactions on Microwave Theory and Techniques, Vol. 65, No. 7, 7855781, 01.07.2017, p. 2547-2557.

Research output: Contribution to journalArticle

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