Reduced field-of-view excitation using second-order gradients and spatial-spectral radiofrequency pulses

Chao Ma, Dan Xu, Kevin F. King, Zhi Pei Liang

Research output: Contribution to journalArticlepeer-review

Abstract

The performance of multidimensional spatially selective radiofrequency (RF) pulses is often limited by their long duration. In this article, high-order, nonlinear gradients are exploited to reduce multidimensional RF pulse length. Specifically, by leveraging the multidimensional spatial dependence of second-order gradients, a two-dimensional spatial-spectral RF pulse is designed to achieve three-dimensional spatial selectivity, i.e., to excite a circular region-of-interest in a thin slice for reduced field-of-view imaging. Compared to conventional methods that use three-dimensional RF pulses and linear gradients, the proposed method requires only two-dimensional RF pulses, and thus can significantly shorten the RF pulses and/or improve excitation accuracy. The proposed method has been validated through Bloch equation simulations and phantom experiments on a commercial 3.0T MRI scanner. Magn Reson Med, 2013. © 2012 Wiley Periodicals, Inc.

Original languageEnglish (US)
Pages (from-to)503-508
Number of pages6
JournalMagnetic Resonance in Medicine
Volume69
Issue number2
DOIs
StatePublished - Feb 2013

Keywords

  • multidimensional radiofrequency pulse
  • Radiofrequency pulse design
  • reduced field-of-view excitation
  • second-order gradient
  • spatial-spectral radiofrequency pulse

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging

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