Field-cycling NMR relaxometry with spatial selection

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

Fast field-cycling MRI offers access to sources of endogenous information not available from conventional fixed-field imagers. One example is the T(1) dispersion curve: a plot of T(1) versus field strength. We present a pulse sequence that combines saturation-recovery/inversion-recovery T(1) determination with field cycling and point-resolved spectroscopy localization, enabling the measurement of dispersion curves from volumes selected from a pilot image. Compared with a nonselective sequence, our method of volume selection does not influence measurement accuracy, even for relatively long echo times and in the presence of radiofrequency field nonuniformity. The measured voxel profile, while not ideal, corresponds with that expected from the image slice profile. On a whole-body fast field-cycling scanner with 59-mT detection, the sensitivity of the experiment is sufficient to reveal distinctive "quadrupole dips" in dispersion curves of protein-rich human tissue in vivo.
Original languageEnglish
Pages (from-to)1698-1702
Number of pages5
JournalMagnetic Resonance in Medicine
Volume63
Issue number6
Early online date23 Apr 2010
DOIs
Publication statusPublished - Jun 2010

Keywords

  • field-cycling
  • T1 relaxometry
  • nuclear magnetic resonance
  • relaxation dispersion

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