5T-Based Glutamate Chemical Exchange Saturation Transfer Imaging for Adult Diffuse Glioma Stratification

Area of Science:

• Neuroimaging
• Biomedical Engineering
• Oncology

Background:

• Glutamate chemical exchange saturation transfer (GLU-CEST) is a non-invasive in vivo method for detecting glutamate.
• Its precise performance in evaluating gliomas at 5 Tesla (5T) requires further definition.

Purpose of the Study:

• To investigate factors influencing 5T GLU-CEST performance.
• To assess the diagnostic value of 5T GLU-CEST in glioma stratification.

Main Methods:

• Prospective study involving five phantom series and 40 adult diffuse glioma patients.
• Utilized 5T fast spin-echo GLU-CEST and amide proton transfer (APT)-CEST MRI sequences.
• Statistical analysis included Spearman correlation, Kruskal-Wallis, Mann-Whitney U, and DeLong tests.

Main Results:

• GLU-CEST signals positively correlated with glutamate and negatively with pH.
• Significant differences in GLU-CEST and APT-CEST metrics were observed between WHO Grade 2 and 4 gliomas.
• GLU-CEST demonstrated superior diagnostic efficacy compared to APT-CEST in classifying IDH status.

Conclusions:

• 5T GLU-CEST can differentiate between WHO Grade 2/4 and Grade 3/4 adult diffuse gliomas.
• This technique shows promise for non-invasive glioma grading and IDH status classification.
• GLU-CEST offers improved performance over APT-CEST for IDH status classification in gliomas.