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Updated: May 3, 2026
Translational Orthotopic Models of Glioblastoma Multiforme
Published on: February 17, 2023
Molecular susceptibility weighted imaging of the glioma rim in a mouse model
Barbara Blasiak1, James Landry2, Randy Tyson3
1Department of Clinical Neurosciences, University of Calgary, 3330 Hospital Drive NW, Calgary, Alberta T2N 4N1, Canada; Polish Academy of Sciences, Institute of Nuclear Physics, Krakow, 152 Radzikowskiego, Krakow, Malopolska 31-342, Poland.
Background:
Glioma is the most common and most difficult to treat brain cancer. Despite many efforts treatment, efficacy remains low. As neurosurgical removal is the standard procedure for glioma, a method, allowing for both early detection and exact determination of the location, size and extent of the tumor, could improve a patient's positive response to therapy.
New Method:
We propose application of susceptibility weighted molecular magnetic resonance imaging using, targeted contrast agents, based on superparamagnetic iron oxide nanoparticles, for imaging of the, glioma rim, namely brain-tumor interface. Iron oxide attached to the targeted cells increases, susceptibility differences at the boundary between tumor and normal tissue, providing the opportunity, to utilize susceptibility weighted imaging for improved tumor delineation. We investigated potential, enhancement of the tumor-brain contrast, including tumor core and rim when using susceptibility, weighted MRI for molecular imaging of glioma.
Results:
There were significant differences in contrast-to-noise ratio before, 12 and 120min after contrast, agent injection between standard gradient echo pulse sequence and susceptibility weighted molecular, magnetic resonance imaging for the core-brain, tumor rim-core and tumor rim-brain areas.
Comparison With Existing Methods:
Currently, the most common MRI contrast agent used for glioma diagnosis is a non-specific, gadolinium-based agent providing T1-weighted enhancement. Susceptibility-weighted magnetic, resonance imaging is much less efficient when no targeted superparamagnetic contrast agents are, used.
Conclusion:
The improved determination of glioma extent provided by SWI offers an important new tool for, diagnosis and surgical planning.
Insights
Susceptibility weighted molecular magnetic resonance imaging (SWI) with targeted nanoparticles improves glioma detection and delineation. This novel approach enhances tumor visualization, aiding surgical planning and patient outcomes.
Area of Science:
- Neuroimaging
- Oncology
- Biomedical Engineering
Background:
- Glioma is a challenging brain cancer with low treatment efficacy.
- Neurosurgical removal is standard, necessitating precise tumor detection and delineation.
- Improved diagnostic methods are crucial for better patient response to therapy.
Purpose of the Study:
- To investigate susceptibility weighted molecular magnetic resonance imaging (SWI) using targeted superparamagnetic iron oxide nanoparticles.
- To evaluate SWI's efficacy in delineating the glioma rim and brain-tumor interface.
- To assess the enhancement of tumor-brain contrast for improved glioma molecular imaging.
Main Methods:
- Application of SWI with targeted superparamagnetic iron oxide nanoparticles for glioma imaging.
- Utilizing susceptibility differences at the brain-tumor interface for enhanced delineation.
- Comparing SWI with standard gradient echo pulse sequences and gadolinium-based contrast agents.
Main Results:
- Significant differences in contrast-to-noise ratio were observed with SWI.
- Enhanced visualization of tumor core, rim, and surrounding brain tissue was achieved.
- SWI demonstrated superior performance compared to standard MRI techniques.
Conclusions:
- SWI with targeted nanoparticles offers improved determination of glioma extent.
- This technique provides a valuable new tool for glioma diagnosis and surgical planning.
- Enhanced tumor delineation can lead to better patient outcomes.
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