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A Strategy for Sensitive, Large Scale Quantitative Metabolomics
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QUESP and QUEST revisited - fast and accurate quantitative CEST experiments.

Moritz Zaiss1, Goran Angelovski2, Eleni Demetriou3

  • 1High Field Magnetic Resonance, Max Planck Institute for Biological Cybernetics, Tübingen, Germany.

Magnetic Resonance in Medicine
|July 8, 2017
PubMed
Summary

Chemical exchange saturation transfer (CEST) experiments enhance detection of low-concentration molecules. New analytical expressions improve the accuracy of exchange rate quantification for CEST agents, leading to better experimental design.

Keywords:
Bloch-McConnellCESTQUESPQUESTparaCESTqCESTquantification

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Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Nuclear Magnetic Resonance (NMR) spectroscopy
  • Biomedical Engineering

Background:

  • Chemical Exchange Saturation Transfer (CEST) techniques enhance sensitivity for detecting low-concentration molecules by exploiting proton exchange with water.
  • Accurate quantification of the exchange rate is crucial for optimizing CEST pulse sequences and designing effective contrast agents.

Purpose of the Study:

  • To refine analytical expressions for improved accuracy in CEST quantification methodologies.
  • To enhance the understanding and application of exchange rate determination in CEST experiments.

Main Methods:

  • Development of refined analytical expressions for quantification of exchange rate using varying saturation power/time (QUESP/QUEST).
  • Evaluation of the methodology using simulated data and experimental data from a paramagnetic CEST agent (Eu(III) complex of DOTA-tetraglycineamide).
  • Focus on improving accuracy under non-equilibrium initial conditions and weak labeling (γB1 < k).

Main Results:

  • The QUESP/QUEST equations provide more accurate exchange rate estimations.
  • The study offers insights into experimental execution and numerical evaluation for CEST.
  • Demonstrated improved exchange rate estimation in the large-shift regime of paramagnetic CEST agents.

Conclusions:

  • Refined formulas lead to enhanced accuracy in exchange rate estimation for CEST.
  • The study discusses general convergence intervals applicable to smaller shift agents.
  • Provides a foundation for more precise CEST-based molecular detection and imaging.