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Broadband phase modulation by adiabatic pulses.

Carlos A Meriles1, Dimitris Sakellariou, Alexander Pines

  • 1Department of Chemistry, University of California and Materials Sciences Division, Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|August 23, 2003
PubMed
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This study presents a new method for magnetic resonance spectroscopy outside magnets using adiabatic pulses. It enables precise control of nuclear spins, leading to clear, inhomogeneity-free spectra.

Area of Science:

  • Magnetic Resonance Spectroscopy
  • Applied Physics
  • Quantum Control

Background:

  • Magnetic resonance spectroscopy (MRS) outside superconducting magnets is challenging due to field inhomogeneities.
  • Controlling nuclear spins over wide frequency ranges is crucial for practical implementation.

Purpose of the Study:

  • To develop an efficient method for phase encoding magnetization in spatially inhomogeneous magnetic fields.
  • To overcome limitations in controlling nuclear spins for external MRS.

Main Methods:

  • Utilizing consecutively applied full-passage adiabatic pulses.
  • Implementing phase modulation independent of frequency offset and RF amplitude.

Main Results:

  • Achieved broadband and selective phase modulation.

Related Experiment Videos

  • Demonstrated near-linear dependence of encoded phase on local RF amplitude.
  • Enabled recovery of inhomogeneity-free spectra with high amplitudes.

    • Conclusions:

    • The developed method efficiently encodes phase information in challenging magnetic field conditions.
    • This technique significantly improves the quality and applicability of external magnetic resonance spectroscopy.
    • The approach offers a pathway to overcome key hurdles in implementing external MRS.