A noniterative method to design large-tip-angle multidimensional spatially-selective radio frequency pulses for parallel transmission

Dan Xu, Kevin F. King, Yudong Zhu, Graeme C. McKinnon, Zhi Pei Liang

Research output: Contribution to journalArticlepeer-review

Abstract

Recently, theoretical and experimental work has shown that parallel transmission of RF pulses can be used to shorten the duration of multidimensional spatially-selective pulses and compensate for B1 field inhomogeneity. However, all the existing noniterative methods can design only excitation pulses for parallel transmission with a small flip angle (e.g., 30°, or at most 90°) and cannot design large-tip-angle inversion/refocusing pulses, because these methods are based on the small-tip-angle (STA) approximation of the Bloch equation. In this work, a method to design large-tip-angle multidimensional spatially-selective pulses for parallel transmission is proposed, based on an extension of the single-channel linear-class large-tip-angle (LCLTA) theory. Design examples of 2D refocusing and inversion parallel transmit pulses and magnetization profiles from Bloch equation simulations demonstrate the strength of the proposed method. A 2D spin-echo parallel transmission experiment on a slab phantom using a 180° refocusing pulse with an eight-channel transmit-only array further validates the effectiveness of the proposed method.

Original languageEnglish (US)
Pages (from-to)326-334
Number of pages9
JournalMagnetic Resonance in Medicine
Volume58
Issue number2
DOIs
StatePublished - Aug 1 2007

Keywords

  • Multidimensional pulse
  • Parallel transmission
  • RF pulse
  • SENSE
  • Transmit sensitivity encoding

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging
  • Radiological and Ultrasound Technology

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