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Frequency offset corrected inversion (FOCI) pulses for use in localized spectroscopy
Author(s) -
Ordidge Roger J.,
Wylezinska Marzena,
Hugg James W.,
Butterworth Edward,
Franconi Florence
Publication year - 1996
Publication title -
magnetic resonance in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.696
H-Index - 225
eISSN - 1522-2594
pISSN - 0740-3194
DOI - 10.1002/mrm.1910360410
Subject(s) - spectroscopy , offset (computer science) , nuclear magnetic resonance , rf power amplifier , inversion (geology) , radio frequency , optics , physics , computational physics , materials science , computer science , telecommunications , bandwidth (computing) , geology , amplifier , paleontology , quantum mechanics , structural basin , programming language
Gradient localized spectroscopy techniques suffer from a well documented spatial localization error caused by the difference in chemical shifts between resonances. This results in the acquisition of spectra from partially overlapping spatial regions of the sample, with each resonance representing a different region. The image‐selected in vivo spectroscopy technique uses hyperbolic secant inversion pulses, where the main limitation in reducing this error is in the RF power available for application of the selective RF pulse. This spatial localization error may be dramatically reduced by increasing, and temporally shaping, the gradient pulse during slice‐selective spin inversion. The performance of these RF pulses have been experimentally verified.