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Quantitative pulsed CEST-MRI using Ω-plots.

Jan-Eric Meissner1,2, Steffen Goerke1, Eugenia Rerich1

  • 1Division of Medical Physics in Radiology, Deutsches Krebsforschungszentrum (DKFZ) [German Cancer Research Center], Heidelberg, Germany.

NMR in Biomedicine
|August 18, 2015
PubMed
Summary
This summary is machine-generated.

This study introduces a new analytical method for pulsed Chemical Exchange Saturation Transfer (CEST) MRI. This approach simplifies quantitative analysis and provides deeper insights into metabolite detection in living tissues.

Keywords:
CESTMRIcreatinepulsed pre-saturationΩ-plot

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Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Biomedical Engineering
  • Metabolomics

Background:

  • Chemical Exchange Saturation Transfer (CEST) enables indirect detection of low-concentration metabolites in vivo using MRI.
  • Current clinical CEST applications are limited by the use of pulsed radiofrequency (RF) saturation, which is theoretically challenging for quantification due to specific absorption rate (SAR) regulations.
  • Accurate quantification of pulsed CEST is difficult, hindering its full potential in clinical settings.

Purpose of the Study:

  • To develop a novel analytical framework for pulsed CEST MRI.
  • To enable accurate quantification of pulsed CEST experiments.
  • To provide deeper theoretical insight into pulsed CEST mechanisms.

Main Methods:

  • An extension of the interleaved saturation-relaxation approach was used for theoretical analysis.
  • Analytical integration of the continuous wave (cw) eigenvalue as a function of RF pulse shape was performed.
  • The method was validated using creatine phantoms on a 7T MRI scanner and further assessed through simulations.

Main Results:

  • A new analytical formula for pulsed CEST was derived, mirroring the structure of cw CEST but including pulse-shape-dependent form factors.
  • The approach allows for analytical Z-spectrum calculations, offering enhanced understanding of pulsed CEST.
  • The extended method successfully adapted Dixon's Ω-plot for pulsed saturation, enabling independent determination of exchange rate and relative proton concentration.

Conclusions:

  • The developed analytical treatment provides a robust method for quantitative pulsed CEST MRI.
  • The derived form factors allow direct comparison between pulsed and continuous wave (cw) saturation effects.
  • This advancement facilitates more accurate and insightful application of CEST MRI in clinical research and diagnostics.