Journal
MAGNETIC RESONANCE IN MEDICINE
Volume 47, Issue 3, Pages 611-615Publisher
WILEY
DOI: 10.1002/mrm.10090
Keywords
high-speed imaging; single-shot STEAM MRI; half-Fourier; human brain
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As a high-speed imaging technique based on stimulated echoes single-shot STEAM MRI is insensitive to chemical shift artifacts and magnetic susceptibility differences. The achievable signal-to-noise ratio (SNR) is limited by the fact that high flip angles of the read-out excitation pulses cause a steep decay of the stimulated echo train and therefore degrade the point-spread function of the resulting image. The present work investigates the use of half-Fourier phase encoding which weakens the flip angle constraint by reducing the number of necessary excitations. Single-shot STEAM MRI of the normal human brain at 2.0 T demonstrates that half-Fourier versions either reduce the measurement time by almost a factor of two without sacrificing the SNR or increase the SNR by about 40% while keeping the measurement time constant. (C) 2002 Wiley-Liss, Inc.
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