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Steady‐state preparation for spoiled gradient echo imaging
Author(s) -
Busse Reed F.,
Riederer Stephen J.
Publication year - 2001
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.1088
Subject(s) - imaging phantom , steady state (chemistry) , pulse sequence , pulse (music) , gradient echo , nuclear magnetic resonance , artifact (error) , computer science , contrast (vision) , magnetization , saturation (graph theory) , physics , materials science , biomedical engineering , magnetic resonance imaging , computer vision , optics , mathematics , radiology , chemistry , magnetic field , medicine , quantum mechanics , combinatorics , detector
While spoiled gradient echo sequences provide a rapid means of acquiring T 1 ‐weighted images, it is often desirable that the magnetization be in the steady state to avoid artifacts. For some applications, this requires many “dummy” repetitions of the pulse sequence prior to data collection, delaying image acquisition. A method is presented in which a saturation pulse, followed by a prescribed recovery period, places longitudinal magnetization levels of all materials near steady state, ready for data acquisition much sooner than when employing only dummy repetitions to achieve steady state. Effects of transverse coherences are studied using configuration theory. The method is shown to be effective in both phantom studies and in vivo applications, including real‐time imaging, multiphase cardiac imaging, and triggered contrast‐enhanced angiography. Magn Reson Med 45:653–661, 2001. © 2001 Wiley‐Liss, Inc.