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Related Experiment Video

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In Vitro Chemical Mapping of G-Quadruplex DNA Structures by Bis-3-Chloropiperidines
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Improved encoding pulses for Bloch-Siegert B1(+) mapping.

Marcin Jankiewicz1, John C Gore, William A Grissom

  • 1Vanderbilt University Institute of Imaging Science, Nashville, TN 37232-2310, USA. m.jankiewicz@vanderbilt.edu

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|December 11, 2012
PubMed
Summary
This summary is machine-generated.

New Bloch-Siegert (BS) pulses offer improved B(1)(+) mapping accuracy. These optimized pulses achieve larger phase shifts faster with less on-resonance excitation, enhancing MRI scans.

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Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Pulse Sequence Design

Background:

  • Bloch-Siegert (BS) B(1)(+) mapping is crucial for accurate MRI.
  • Conventional Fermi pulses have limitations in sensitivity and on-resonance excitation.

Purpose of the Study:

  • Introduce novel, optimized encoding pulses for BS B(1)(+) mapping.
  • Develop an algorithm for designing these improved BS pulses.

Main Methods:

  • Numerical maximization of BS sequence sensitivity.
  • Design pulses with constant envelope and U-shaped frequency sweep.
  • Validation through simulations and 7T in vivo experiments.

Main Results:

  • Optimized pulses achieve larger phase shifts in shorter times.
  • Demonstrated lower on-resonance excitation compared to Fermi pulses.
  • Reduced Specific Absorption Rate (SAR) and improved B(1)(+) accuracy.

Conclusions:

  • The new BS pulses enhance B(1)(+) mapping accuracy, especially in challenging magnetic field conditions.
  • These pulses offer a superior alternative to conventional methods for quantitative MRI.
  • Optimized pulses improve accuracy in regions with significant main field inhomogeneities.