Correction for the Effect of Induced B0 Shifts in Localized Spectroscopy and Imaging by Direct Frequency Modulation

Crozier S., Beckey F.A., Eccles C.D., Field J. and Doddrell D.M. (1994) Correction for the Effect of Induced B0 Shifts in Localized Spectroscopy and Imaging by Direct Frequency Modulation. Journal of Magnetic Resonance, Series B, 103 2: 115-119. doi:10.1006/jmrb.1994.1018


Author Crozier S.
Beckey F.A.
Eccles C.D.
Field J.
Doddrell D.M.
Title Correction for the Effect of Induced B0 Shifts in Localized Spectroscopy and Imaging by Direct Frequency Modulation
Journal name Journal of Magnetic Resonance, Series B   Check publisher's open access policy
ISSN 1064-1866
Publication date 1994
Sub-type Article (original research)
DOI 10.1006/jmrb.1994.1018
Volume 103
Issue 2
Start page 115
End page 119
Total pages 5
Subject 2200 Engineering
Abstract A new method is presented for the amelioration of eddy-current-induced B0 shifts based on direct FM modulation of the spectrometer transmitter and receiver reference frequencies. The waveform for correction is based on a dynamic spherical-harmonic expansion of the temporal field, requiring no functional fitting and accounting fully for all gradient transitions in a given sequence. The importance of fully sequence-specific correction of these B0 shifts during slice selection in imaging and localized experiments is demonstrated experimentally and modeled in part using rotation-matrix calculations. The results demonstrate the utility of the correction technique and indicate that it is advantageous to correct even the small shifts associated with shielded gradients in order to produce optimal slice refocusing.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: Scopus Import
 
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