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Dynamic glucose enhanced imaging using direct water saturation.

Linda Knutsson^1,2,3, Nirbhay N Yadav^1,4, Sajad Mohammed Ali³

¹F.M. Kirby Research Center for Functional Brain Imaging, Kennedy Krieger Institute, Baltimore, Maryland, USA.

|November 6, 2024

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This summary is machine-generated.

Dynamic glucose-enhanced (DGE) MRI using direct water saturation (DS-DGE MRI) shows promise for assessing glucose uptake. This novel method visualizes glucose metabolism in brain tumors, offering results comparable to perfusion-weighted imaging.

Area of Science:

Magnetic Resonance Imaging
Biomedical Engineering
Radiology

Background:

Dynamic glucose-enhanced (DGE) MRI techniques like CEST and CESL are used to study glucose uptake.
Current DGE MRI methods suffer from low effect size and motion sensitivity.
A new approach is needed to improve the accuracy and reliability of DGE MRI.

Purpose of the Study:

To introduce and validate a novel DS-DGE MRI technique.
To assess glucose-infusion-induced linewidth (LW) changes in various tissues.
To evaluate the potential of DS-DGE MRI for brain tumor imaging.

Main Methods:

Utilized exchange-based linewidth broadening of the direct water saturation (DS) curve.
Performed Bloch-McConnell simulations for normoglycemia and hyperglycemia in different tissues.

Keywords:

CEST Z-spectra direct saturation (DS)dynamic glucose enhanced (DGE) MRI glucoCEST

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Implemented whole-brain DS-DGE imaging at 3 tesla with dynamic Z-spectral acquisitions.

Employed a deep learning-based Lorentzian fitting approach to assess LW changes.

Compared area-under-the-curve (AUC) maps to perfusion-weighted imaging (PWI) in brain tumor patients.

Main Results:

Simulations predicted varying LW changes across different tissues.
In vivo studies showed significant LW changes in GM/WM, tumors, and CSF.
DS-DGE AUC maps effectively outlined lesion areas in brain tumor patients.
Results demonstrated DGE-based lesion enhancement comparable and complementary to PWI.

Conclusions:

DS-DGE MRI is a promising technique for assessing D-glucose uptake.
The method provides high-quality AUC maps of glucose-induced line broadening.
DS-DGE MRI shows potential for brain tumor assessment, complementing existing imaging modalities.