Journal
MAGNETIC RESONANCE IN MEDICINE
Volume 47, Issue 2, Pages 398-402Publisher
JOHN WILEY & SONS INC
DOI: 10.1002/mrm.10050
Keywords
structural imaging; MP-RAGE; RF pulse; RF inhomogeneity; anatomical imaging
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Three-dimensional T-1-weighted magnetization-prepared rapid gradient-echo (MP-RAGE) sequences with centric phase encoding (PE) in the inner loop provide structural brain images with a high spatial resolution and high tissue contrast. A disadvantage of this sequence type is the susceptibility to inhomogeneities of the radiofrequency (RF) coil, which may result in poor image contrast in some peripheral regions. A special excitation pulse is presented which compensates for these effects in both the head/foot and anterior/posterior directions. This pulse has a duration of only 1.3 ms and is thus compatible with the short repetition times (TRs) required for MP-RAGE imaging. It is shown experimentally that images acquired with the compensation pulse may be segmented without using intensity correction algorithms during data postprocessing. Magn Reson Med 47:398-402, 2002. (C) 2002 Wiley-Liss, Inc.
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