An RF field pattern with improved B1 amplitude homogeneity

Zhiyue J. Wang, Dah Jyuu Wang

Research output: Contribution to journalArticle

6 Scopus citations

Abstract

Providing uniform RF excitation across the sample is challenging in building high-field human MRI scanners. The traditional design strategy for the RF power transmission has been trying to achieve a spatial distribution of B1 that is as uniform as possible in amplitude and direction. The fundamental limitation of this approach is that a constant solution of B 1 is not available from the Maxwell equations at radio frequencies. Here, a new design strategy is introduced that takes advantage of solutions of the Maxwell equations that have a B1 with uniform amplitude and varying direction in a lossless medium. In lossy media the B1 amplitude also varies in space, but there is no intrinsic penalty in the homogeneity due to increases of the real part of the wave vector at higher fields. We demonstrate how it might be realized for RF excitation through a computer simulation for a uniform medium.

Original languageEnglish (US)
Pages (from-to)1-5
Number of pages5
JournalConcepts in Magnetic Resonance Part B: Magnetic Resonance Engineering
Volume24
Issue number1
DOIs
StatePublished - Feb 1 2005

Keywords

  • B amplitude
  • B field inhomogeneity
  • High-field MRI
  • RF excitation

ASJC Scopus subject areas

  • Radiological and Ultrasound Technology
  • Radiology Nuclear Medicine and imaging
  • Spectroscopy
  • Physical and Theoretical Chemistry

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