Rapid radiofrequency field mapping in vivo using single-shot STEAM MRI.

Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine
Gunther HelmsPeter Dechent

Abstract

Higher field strengths entail less homogeneous RF fields. This may influence quantitative MRI and MRS. A method for rapidly mapping the RF field in the human head with minimal distortion was developed on the basis of a single-shot stimulated echo acquisition mode (STEAM) sequence. The flip angle of the second RF pulse in the STEAM preparation was set to 60 degrees and 100 degrees instead of 90 degrees , inducing a flip angle-dependent signal change. A quadratic approximation of this trigonometric signal dependence together with a calibration accounting for slice excitation-related bias allowed for directly determining the RF field from the two measurements only. RF maps down to the level of the medulla could be obtained in less than 1 min and registered to anatomical volumes by means of the T(2)-weighted STEAM images. Flip angles between 75% and 125% of the nominal value were measured in line with other methods.

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Citations

Jul 25, 2012·Cerebral Cortex·Martin I SerenoFrederic Dick
Mar 20, 2012·PloS One·Antoine LuttiNikolaus Weiskopf
Nov 16, 2012·The Journal of Neuroscience : the Official Journal of the Society for Neuroscience·Frederic DickNikolaus Weiskopf
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Feb 29, 2008·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Gunther HelmsPeter Dechent
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Software Mentioned

FSL
KaleidaGraph
STEAM

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