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Ultra broadband NMR spectroscopy using multiple rotating frame technique.

Navin Khaneja1, Abhinav Dubey2, Hanudatta S Atreya2

  • 1Department of Electrical Engineering, IIT Bombay, Powai 400076, India.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|February 22, 2016
PubMed
Summary
This summary is machine-generated.

Researchers developed a new method using multiple rotating frames to achieve broadband excitation and inversion pulses. This technique overcomes limitations of wide chemical shift ranges, enabling uniform excitation across spectra.

Keywords:
Broadband excitationBroadband inversionChemical shiftMultiple rotating frames

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Area of Science:

  • Nuclear Magnetic Resonance (NMR) Spectroscopy
  • Pulse Sequence Design
  • Magnetic Resonance Imaging (MRI)

Background:

  • Achieving perfect excitation and inversion in NMR requires all nuclei to be on resonance, which is challenging with wide chemical shift ranges.
  • Existing methods struggle to achieve uniform excitation across broad spectral widths due to chemical shift dispersion.
  • The multiple rotating frame technique offers a potential solution to overcome these limitations.

Purpose of the Study:

  • To design broadband radiofrequency (RF) excitation and inversion pulses using the multiple rotating frame technique.
  • To overcome the limitations imposed by wide chemical shift ranges in NMR spectroscopy.
  • To demonstrate the feasibility of achieving uniform excitation over large bandwidths.

Main Methods:

  • Utilized a multiply modulated RF field, analyzed by progressing through multiple rotating frames.
  • In each frame, the ratio of chemical shift dispersion to static RF field strength is reduced.
  • The final frame exhibits negligible chemical shift relative to the effective RF field, enabling efficient excitation and inversion.

Main Results:

  • The method successfully achieves broadband excitation and inversion, even with wide chemical shift ranges.
  • Increasing the number of frames enhances excitation bandwidth and the ratio of bandwidth to root-mean-square (rms) excitation amplitude.
  • Experimental demonstration showed uniform (1)H excitation over a 52 kHz bandwidth with a 10 kHz rms amplitude using an 8-frame pulse sequence, validated on 100% (13)C labeled arginine spectra.

Conclusions:

  • The multiple rotating frame technique effectively enables broadband excitation and inversion pulses in NMR.
  • This approach allows for arbitrary excitation bandwidths for a given rms RF amplitude by increasing the number of frames.
  • The experimental results confirm the method's capability for uniform spectral excitation, crucial for complex biological molecules.