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Saturated double-angle method for rapid B1+ mapping.

Charles H Cunningham1, John M Pauly, Krishna S Nayak

  • 1Magnetic Resonance Systems Research Laboratory, Department of Electrical Engineering, Stanford University, CA 90089, USA.

Magnetic Resonance in Medicine
|May 10, 2006
PubMed
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This study introduces a rapid B(1)+ mapping technique for high-field MRI, improving accuracy and speed. The method allows for quick volumetric coverage, essential for clinical applications like cardiac imaging.

Area of Science:

  • Magnetic Resonance Imaging
  • Medical Physics
  • Radiology

Background:

  • High-field (>=3 T) in vivo MRI necessitates B(1)+ field homogeneity assessment, especially with surface coils.
  • Accurate B(1)+ mapping is crucial for quantitative MRI and RF pulse design.

Purpose of the Study:

  • To present a novel, highly rapid method for B(1)+ magnitude mapping.
  • To enable fast volumetric B(1)+ coverage with adequate spatial resolution.

Main Methods:

  • Combines the double angle method with a B(1)-insensitive magnetization-reset sequence.
  • Utilizes multislice segmented spiral acquisition for rapid volumetric coverage.
  • Achieves TR independence from T(1) relaxation time.

Main Results:

Related Experiment Videos

  • Validated accuracy in phantom experiments, even with TR << T(1).
  • Demonstrated feasibility for B(1)+ mapping in the chest and abdomen within a single breath-hold.
  • Enabled whole-heart coverage in 16 seconds for cardiac imaging at 1.5 T and 3 T.

Conclusions:

  • The presented method offers a significant speed improvement for B(1)+ mapping.
  • This technique is suitable for clinical applications requiring fast, accurate B(1)+ assessment.
  • The method enhances the reliability of high-field MRI, particularly in challenging anatomical regions.