Excitation and RF field control of a human-size 10.5-T MRI system

Patrick Bluem, Pierre Francois Van De Moortele, Gregor Adriany, Zoya Popovic

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

This paper presents an investigation of methods for improving homogeneity inside various dielectric phantoms situated in a 10.5-T human-sized magnetic resonance imaging. The transmit B1 (B+ 1 ) field is excited with a quadrature-fed circular patch probe and a 12-element capacitively loaded microstrip array. Both simulations and measurements show improved homogeneity in a cylindrical water phantom, an inhomogeneous phantom (pineapple), and a NIST standard phantom. The simulations are performed using a full-wave finite-difference time-domain solver (Sim4Life) in order to find the B+ 1 field distribution and compared to the gradient-recalled echo image and efficiency result. For additional field uniformity, the wall electromagnetic boundary conditions are modified with a passive quadrifilar helix. Finally, these methods are applied in simulation to head imaging of an anatomically correct human body model (Duke, IT'IS Virtual Population) showing improved homogeneity and specific absorption rate for various excitations.

Original languageEnglish (US)
Article number8576556
Pages (from-to)1184-1196
Number of pages13
JournalIEEE Transactions on Microwave Theory and Techniques
Volume67
Issue number3
DOIs
StatePublished - Mar 2019

Bibliographical note

Publisher Copyright:
© 1963-2012 IEEE.

Keywords

  • Finite-difference time domain (FDTD)
  • magnetic resonance imaging (MRI)
  • patch antenna
  • waveguide

Center for Magnetic Resonance Research (CMRR) tags

  • MRE

PubMed: MeSH publication types

  • Journal Article

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