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Spin‐locked balanced steady‐state free‐precession (slSSFP)
Author(s) -
Witschey Walter R.T.,
Borthakur Ari,
Elliott Mark A.,
Magland Jeremy,
McArdle Erin L.,
Wheaton Andrew,
Reddy Ravinder
Publication year - 2009
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.22092
Subject(s) - precession , steady state (chemistry) , physics , pulse (music) , steady state free precession imaging , nuclear magnetic resonance , spin (aerodynamics) , larmor precession , flip angle , bloch equations , transient (computer programming) , pulse sequence , signal (programming language) , rf power amplifier , power (physics) , spin echo , computational physics , magnetic resonance imaging , optics , condensed matter physics , computer science , chemistry , magnetic field , amplifier , quantum mechanics , detector , optoelectronics , operating system , radiology , programming language , thermodynamics , medicine , cmos
A spin‐locked balanced steady‐state free‐precession (slSSFP) pulse sequence is described that combines a balanced gradient‐echo acquisition with an off‐resonance spin‐lock pulse for fast MRI. The transient and steady‐state magnetization trajectory was solved numerically using the Bloch equations and was shown to be similar to balanced steady‐state free‐precession (bSSFP) for a range of T 2 / T 1 and flip angles, although the slSSFP steady‐state could be maintained with considerably lower radio frequency (RF) power. In both simulations and brain scans performed at 7T, slSSFP was shown to exhibit similar contrast and signal‐to‐noise ratio (SNR) efficiency to bSSFP, but with significantly lower power. Magn Reson Med, 2009. © 2009 Wiley‐Liss, Inc.