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Steady state effects in fast gradient echo magnetic resonance imaging
Author(s) -
Duyn Jeff H.
Publication year - 1997
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.1910370414
Subject(s) - sensitivity (control systems) , modulation (music) , nuclear magnetic resonance , physics , signal (programming language) , flip angle , phase (matter) , echo (communications protocol) , steady state (chemistry) , fourier transform , echo time , magnetic resonance imaging , optics , materials science , acoustics , computer science , chemistry , electronic engineering , medicine , computer network , quantum mechanics , engineering , radiology , programming language
Fourier methodology is applied to analyze steady state effects in fast gradient echo imaging. Simulations and MR imaging experiments on phantoms demonstrate the effectiveness of existing schemes under different experimental conditions, and modifications are introduced which result in reduced sensitivity to slow object motion as compared to conventional phase modulation schemes. In addition, phase modulation schemes are introduced which more than double temporal signal stability in human brain scans, at flip angles well above the Ernst angle and TR >> T 1 , T 2 . Application of phase modulation to the measurement of higher order signals shows increased sensitivity, particularly for the highest order signals.