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Fast broadband inversion by adiabatic pulses

T L Hwang1, P C van Zijl, M Garwood

  • 1Department of Radiology and Biophysics and Biophysical Chemistry, Johns Hopkins University School of Medicine, 217 Traylor Building, Baltimore, Maryland, 21205, USA.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|July 9, 1998
PubMed
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Adiabatic pulses can efficiently achieve broadband inversion for carbon-13 and proton nuclei in high-resolution Nuclear Magnetic Resonance (NMR). Optimized adiabatic pulses offer a viable alternative, overcoming previous limitations of time and power requirements.

Area of Science:

  • Nuclear Magnetic Resonance (NMR) Spectroscopy
  • Quantum Control

Background:

  • Adiabatic pulses offer advantages in compensating for resonance offset and B1 inhomogeneity in NMR.
  • However, their widespread adoption in high-resolution NMR is limited by perceived requirements for longer pulse durations or higher power.

Purpose of the Study:

  • To demonstrate that optimized adiabatic pulses can achieve broadband inversion for 13C and 1H nuclei.
  • To address the misconception that adiabatic pulses are impractical due to time or power constraints.

Main Methods:

  • Utilized adiabatic pulses with tangential frequency sweeps and other optimized frequency modulation functions.
  • Investigated pulse performance at B1 strengths compatible with modern high-resolution NMR probes.

Main Results:

Related Experiment Videos

  • Achieved broadband inversion for 13C nuclei using a pulse length of 192 microseconds.
  • Achieved broadband inversion for 1H nuclei using a pulse length of 64 microseconds.
  • Demonstrated feasibility at accessible B1 field strengths.

Conclusions:

  • Optimized adiabatic pulses are effective for broadband inversion in high-resolution NMR.
  • These pulses can be implemented with practical pulse lengths and power levels, making them a viable technique.