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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.
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Updated: Sep 12, 2025

Paramagnetic Relaxation Enhancement for Detecting and Characterizing Self-Associations of Intrinsically Disordered Proteins
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Quantitative macromolecular proton fraction imaging using pulsed spin-lock.

Qianxue Shan1, Ziqiang Yu1, Baiyan Jiang1,2

  • 1Department of Imaging and Interventional Radiology, The Chinese University of Hong Kong, Hong Kong SAR, China.

Magnetic Resonance in Medicine
|August 5, 2025
PubMed
Summary
This summary is machine-generated.

A new method, MPF mapping using pulsed spin-lock (MPF-PSL), simplifies quantitative magnetization transfer imaging. This technique overcomes hardware limitations for robust macromolecular proton fraction quantification, showing promise for clinical applications like liver fibrosis detection.

Keywords:
liver fibrosismacromolecular proton fractionmagnetization transferpulsed spin‐lock

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Area of Science:

  • Magnetic Resonance Imaging
  • Quantitative Imaging

Background:

  • Quantitative magnetization transfer (MT) imaging simplifies macromolecular proton fraction (MPF) quantification by removing dependency on water pool parameters and T1 maps.
  • Current spin-lock MRI methods for MPF quantification are limited by long radiofrequency (RF) pulse durations, constrained by hardware and specific absorption rate (SAR) limits.

Purpose of the Study:

  • To develop a novel method, MPF mapping using pulsed spin-lock (MPF-PSL), to overcome limitations of existing spin-lock MRI techniques for quantitative MT imaging.
  • To enable extended spin-lock durations within hardware and SAR safety limits for improved MPF quantification.

Main Methods:

  • MPF-PSL utilizes a pulsed spin-lock train with intermittent free precession periods to achieve extended total spin-lock durations.
  • An analytical framework was developed to model magnetization dynamics, ensuring MT-specific quantification and minimizing water pool confounding effects.
  • The method was validated using Bloch-McConnell simulations, phantom studies, and in vivo 3T MRI.

Main Results:

  • Simulations and phantom studies confirmed MPF-PSL's insensitivity to water pool parameters and robust MPF quantification.
  • In vivo studies demonstrated the clinical utility of MPF-PSL for detecting collagen deposition in liver fibrosis patients.

Conclusions:

  • MPF-PSL offers a practical and effective solution for quantitative MT imaging.
  • The method shows significant potential for widespread clinical applications, particularly in assessing tissue fibrosis.