NMR with excitation modulated by Frank sequences

Bernhard Bluemich*, Qingxia Gong, Eimear Byrne, Marcus Greferath

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

21 Citations (Scopus)

Abstract

Miniaturized NMR is of growing importance in bio-, chemical, and -material sciences. Other than the magnet, bulky components are the radio-frequency power amplifier and the power supply or battery pack. We show that constant flip-angle excitation with phase modulation following a particular type of polyphase perfect sequences results in low peak excitation power at high response peak power. It has ideal power distribution in both the time domain and the frequency domain. A savings in peak excitation power of six orders of magnitude has been realized compared to conventionally pulsed excitation. Among others, the excitation promises to be of use for button-cell operated miniature NMR devices as well as for complying with specific-absorption-rate regulations in high-field medical imaging. (C) 2009 Elsevier Inc. All rights reserved.

Original languageEnglish
Pages (from-to)18-24
Number of pages7
JournalJOURNAL OF MAGNETIC RESONANCE
Volume199
Issue number1
DOIs
Publication statusPublished - Jul 2009
MoE publication typeA1 Journal article-refereed

Keywords

  • integer residue rings
  • polyphase perfect sequences
  • Frank sequences
  • Chu sequences
  • excitation
  • NMR
  • MRI

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