Optic radiation fiber tractography in glioma patients based on high angular resolution diffusion imaging with...

Area of Science:

• Neuroimaging
• Radiology
• Medical Physics

Background:

• Diffusion Tensor Imaging (DTI) is standard for clinical fiber tractography but struggles with complex fiber structures and areas near tumors.
• High Angular Resolution Diffusion Imaging (HARDI) offers better resolution but requires longer scan times due to more diffusion gradients.
• Compressed Sensing (CS) can reduce the number of gradients needed for HARDI, potentially making it clinically feasible.

Purpose of the Study:

• To evaluate the efficacy of HARDI combined with Compressed Sensing (HARDI+CS) for optic radiation (OR) fiber tractography in patients with temporal lobe gliomas.
• To compare HARDI+CS tractography with conventional DTI-based tractography in this clinical setting.

Main Methods:

• Eight patients with temporal lobe gliomas underwent 3T MRI with a diffusion-weighted dataset (30 gradient directions).
• Fiber tractography of the optic radiation was performed using both DTI and HARDI+CS.
• Tractography results were compared between the two methods.

Main Results:

• HARDI+CS tractography provided more conclusive visualization of the optic radiation in all eight patients compared to DTI.
• The benefits of HARDI+CS were particularly evident in cases with high-grade gliomas, significant peritumoral edema, larger tumor size, or closer proximity to the OR.

Conclusions:

• HARDI+CS overcomes the limitation of long acquisition times associated with traditional HARDI.
• HARDI+CS is a promising technique for fiber tractography of the optic radiation in challenging regions, such as those affected by gliomas and surrounding edema.
• This technique holds significant potential for improving surgical planning in glioma operations.