期刊
MAGNETIC RESONANCE IN MEDICINE
卷 46, 期 1, 页码 24-30出版社
WILEY
DOI: 10.1002/mrm.1156
关键词
high-field MRI; RF power; RF homogeneity; signal-to-noise
资金
- NCI NIH HHS [CA64338, CA76535] Funding Source: Medline
- NCRR NIH HHS [RR08079] Funding Source: Medline
Signal-to-noise ratio (SNR), RF field (B,), and RF power requirement for human head imaging were examined at 7T and 4T magnetic field strengths. The variation in B, magnitude was nearly twofold higher at 7T than at 4T (similar to 42% compared to similar to 23%). The power required for a 90 degrees pulse in the center of the head at 7T was approximately twice that at 4T, The SNR averaged over the brain was at least 1.6 times higher at 7T compared to 4T, These experimental results were consistent with calculations performed using a human head model and Maxwell's equations, (C) 2001 Wiley-Liss, Inc.
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