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Trade-off between angular and spatial resolutions in in vivo fiber tractography
Sjoerd B Vos1, Murat Aksoy2, Zhaoying Han2
1Image Sciences Institute, University Medical Center Utrecht, Utrecht, The Netherlands; Department of Radiology, Lucas Center, Stanford University, Stanford, CA, United States.
Neuroimage
|January 18, 2016
Summary
High angular resolution is more critical than spatial resolution for accurate diffusion MRI tractography. Investing scan time in angular resolution improves white matter connection reconstructions more effectively.
Area of Science:
- Neuroimaging
- Biomedical Engineering
- Radiology
Background:
- Diffusion MRI tractography reconstructs white matter connections in vivo.
- High angular and spatial resolutions are crucial for accurate fiber tracking.
- Clinical scan times limit achievable resolutions.
Purpose of the Study:
- To investigate the trade-off between spatial and angular resolution in diffusion MRI tractography.
- To determine which resolution parameter is more critical for improving tract reconstruction quality.
Main Methods:
- A high-resolution diffusion MRI dataset (1.0 mm isotropic, 100 directions) was acquired.
- Subsets with reduced angular (75, 50, 25 directions) and spatial (1.5, 2.0, 2.5 mm) resolutions were created.
- Tractography was performed on all subsets, analyzing volumetric overlap and anatomical correspondence in key white matter tracts.
Main Results:
- Tract reconstructions were inferior with 25 and 50 directions compared to 75 and 100 directions.
- Spatial resolutions of 1.0, 1.5, and 2.0 mm yielded comparable results.
- A spatial resolution of 2.5 mm resulted in discernible quality degradation.
Conclusions:
- Angular resolution significantly influences tractography accuracy more than spatial resolution.
- Prioritizing angular resolution over spatial resolution (above 2.0 mm) is recommended for improved tractography.
- Optimizing scan time for angular resolution enhances white matter connection reconstruction.
