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Field mapping without reference scan using asymmetric echo-planar techniques.

R Gruetter1, I Tkác

  • 1Department of Radiology, University of Minnesota, Minneapolis, USA. gruetter@cmrr.umn.edu

Magnetic Resonance in Medicine
|February 19, 2000
PubMed
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This study introduces a faster method for magnetic field mapping in MRI, reducing scan time by half. The technique optimizes sensitivity and minimizes static field measurement errors to under 0.1 Hz.

Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Biophysics
  • Medical Physics

Background:

  • Accurate magnetic field mapping (Bo) and shimming are crucial for high-resolution MRI.
  • Traditional methods can be time-consuming and sensitive to magnetic field variations (T2*).

Purpose of the Study:

  • To develop an accelerated and robust method for Bo mapping and shimming.
  • To improve the accuracy and efficiency of static magnetic field measurements in MRI.

Main Methods:

  • Utilized an asymmetric echo-planar readout gradient train to measure static field information from multiple echoes.
  • Implemented careful compensation for eddy current effects.
  • Employed adiabatic low flip-angle excitation.

Main Results:

Related Experiment Videos

  • Achieved a two-fold reduction in field mapping time.
  • Minimized the impact of eddy currents on shim coil adjustments.
  • Optimized sensitivity irrespective of T2*.
  • Reduced static field measurement error to below 0.1 Hz.
  • Completed field mapping in under 1 second.

Conclusions:

  • The novel method significantly accelerates Bo mapping and shimming.
  • The technique offers improved accuracy and robustness, independent of T2* effects.
  • This advancement holds potential for faster and more precise MRI examinations.