Field mapping without reference scan using asymmetric echo-planar techniques

Rolf Gruetter, Ivan Tkac

Research output: Contribution to journalArticlepeer-review

432 Scopus citations

Abstract

Improvements in B(o) mapping and shimming were achieved by measuring the static field information in multiple subsequent echoes generated by an asymmetric echo-planar readout gradient train. With careful compensation, eddy current effects were shown to affect the adjustment of the shim coils minimally. In addition to reducing the time required for field mapping by two-fold, the sensitivity was simultaneously optimized irrespective of the prevalent T2/* present, thereby minimizing the error of the static field measurement to below 0.1 Hz. With adiabatic low flip-angle excitation, the time required for field mapping was below 1 second. (C) 2000 Wiley-Liss, Inc.

Original languageEnglish (US)
Pages (from-to)319-323
Number of pages5
JournalMagnetic resonance in medicine
Volume43
Issue number2
DOIs
StatePublished - 2000

Keywords

  • B(o) imaging
  • BOLD
  • EPI
  • Field mapping
  • Shimming
  • Spectroscopy

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