7T vs. 4T: RF power, homogeneity, and signal‐to‐noise comparison in head images
Magnetic Resonance in Medicine2001Vol. 46(1), pp. 24–30
Citations Over TimeTop 1% of 2001 papers
J. Thomas Vaughan, Michael Garwood, Christopher M. Collins, W. Liu, Lance DelaBarre, Gregor Adriany, Peter E. Andersen, Hellmut Merkle, Rainer Goebel, Michael B. Smith, Kâmil Uǧurbil
Abstract
Signal-to-noise ratio (SNR), RF field (B(1)), and RF power requirement for human head imaging were examined at 7T and 4T magnetic field strengths. The variation in B(1) magnitude was nearly twofold higher at 7T than at 4T ( approximately 42% compared to approximately 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. Magn Reson Med 46:24-30, 2001.
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