Quantitative susceptibility mapping evaluation of glioma

Area of Science:

• Neuroimaging
• Oncology
• Radiology

Background:

• Gliomas are primary brain tumors with diverse characteristics.
• Accurate glioma evaluation is crucial for diagnosis and treatment planning.
• Quantitative susceptibility mapping (QSM) offers novel insights into tissue magnetic properties.

Purpose of the Study:

• To comprehensively evaluate gliomas using quantitative susceptibility mapping (QSM).
• To assess the association between QSM-derived magnetic susceptibility and glioma characteristics.
• To explore QSM's utility in differentiating glioma subtypes and grades.

Main Methods:

• Retrospective analysis of 42 patients with pathologically confirmed gliomas.
• Acquisition of conventional and advanced MRI including QSM, DWI, and MRS.
• Manual delineation of regions of interest (ROIs) to quantify tumor parenchyma magnetic susceptibility.
• Correlation analysis between magnetic susceptibility and other MRI parameters and clinical data.

Main Results:

• Heterogeneous intratumoral susceptibility signal (ITSS) in QSM correlated with high-grade gliomas, tumor hemorrhage, necrosis, diffusion restriction, and avid enhancement.
• Low magnetic susceptibility in tumor parenchyma showed high specificity for identifying oligodendrogliomas in IDH-mutated gliomas.
• Tumor parenchyma magnetic susceptibility significantly correlated with ADC (r=0.61) and Cho/NAA (r=0.40).

Conclusions:

• QSM is a valuable tool for comprehensive glioma evaluation, aiding in morphological assessment and subtype identification.
• QSM shows potential in differentiating glioma grades and identifying specific subtypes like oligodendroglioma.
• Magnetic susceptibility of tumor parenchyma may be influenced by tumor cell proliferation and metabolic activity.