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Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...

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Measuring the Spin-Lattice Relaxation Magnetic Field Dependence of Hyperpolarized [1-13C]pyruvate
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Published on: September 13, 2019

Optimal variable flip angle schemes for dynamic acquisition of exchanging hyperpolarized substrates.

Yan Xing1, Galen D Reed, John M Pauly

  • 1Department of Radiology and Biomedical Imaging, University of California-San Francisco, San Francisco, CA, United States.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|July 13, 2013
PubMed
Summary

Novel variable flip angle schemes optimize hyperpolarized MRI by managing magnetization decay and conversion. This enhances signal-to-noise ratio for improved metabolic imaging and characterization of tissue perfusion.

Keywords:
Dynamic MRSIHyperpolarized carbon-13Multi-band RF pulseRF pulse designVariable flip angle

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Area of Science:

  • Magnetic Resonance Imaging
  • Metabolic Imaging
  • Biophysics

Background:

  • Dynamic hyperpolarized MRI signal intensity is affected by T1 decay, T2 decay, and metabolic conversion.
  • Optimizing the use of limited hyperpolarized magnetization is crucial for effective dynamic imaging.
  • Specialized radiofrequency (RF) pulse sequences are needed to manage these signal variations.

Purpose of the Study:

  • To introduce and optimize novel variable flip angle (VFA) schemes for dynamic hyperpolarized MRI.
  • To improve the even distribution of magnetization throughout dynamic acquisitions.
  • To enhance the signal-to-noise ratio (SNR) of metabolic imaging.

Main Methods:

  • Developed two VFA schemes varying flip angles between excitations and metabolites.
  • Optimized schemes to account for T1 decay, prior RF excitations, and metabolic conversion.
  • Implemented schemes using multiband spectral-spatial RF pulses for independent flip angle modulation across chemical shifts.

Main Results:

  • Simulations confirmed the effectiveness of the VFA designs.
  • Evaluated signal dynamics across a range of T1 values and metabolic conversion rates.
  • Observed increased SNR for [1-(13)C]lactate derived from [1-(13)C]pyruvate, especially at later time points.

Conclusions:

  • The novel VFA schemes effectively distribute hyperpolarized magnetization.
  • These schemes improve SNR in dynamic hyperpolarized MRI.
  • Enhanced SNR allows for better characterization of tissue perfusion and metabolic profiles.