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Updated: May 23, 2026

Co-analysis of Brain Structure and Function using fMRI and Diffusion-weighted Imaging

Co-analysis of Brain Structure and Function using fMRI and Diffusion-weighted Imaging

Published on: November 8, 2012

Angular versus spatial resolution trade-offs for diffusion imaging under time constraints.

Liang Zhan¹, Neda Jahanshad, Daniel B Ennis

¹Department of Neurology, Laboratory of Neuro Imaging, UCLA School of Medicine, Los Angeles, California.

Human Brain Mapping

|April 24, 2012

Summary

This summary is machine-generated.

Higher angular resolution and larger voxels in diffusion MRI improve signal-to-noise and stability. However, larger voxels can bias fractional anisotropy (FA) estimates, a limitation partially overcome by advanced diffusion models.

Keywords:

angular resolution diffusion tensor imaging high angular resolution diffusion imaging orientation distribution function reproducibility spatial resolution tensor distribution function

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Diffusion Tensor Magnetic Resonance Imaging in the Analysis of Neurodegenerative Diseases

Diffusion Tensor Magnetic Resonance Imaging in the Analysis of Neurodegenerative Diseases

Published on: July 28, 2013

Area of Science:

Neuroimaging
Biomedical Engineering
Radiology

Background:

Diffusion-weighted magnetic resonance imaging (DW-MRI) is crucial for assessing brain integrity and connectivity.
Optimizing DW-MRI scanning parameters is vital for accurate, stable, and high-signal-to-noise diffusion measures.
Understanding trade-offs between spatial and angular resolution is key for parameter optimization.

Purpose of the Study:

To investigate the impact of spatial versus angular resolution trade-offs on diffusion MRI measures.
To evaluate how these trade-offs affect standard tensor-derived metrics and advanced diffusion models.
To assess the stability and signal-to-noise ratio (SNR) of diffusion measures under varying resolutions.

Main Methods:

Eight subjects were scanned twice, 2 weeks apart, using three 7-minute DW-MRI protocols with varying voxel sizes (3.0, 2.7, 2.5 mm) and gradient numbers (48, 41, 37).
A DTI phantom was scanned with identical protocols and varying b-values.
Diffusion measures (FA, MD, ODF) and stability were assessed, alongside an information uncertainty index.

Main Results:

Increased angular resolution and larger voxel sizes enhanced SNR and temporal stability for diffusion MRI measures.
Larger voxels introduced partial voluming effects, biasing fractional anisotropy (FA) estimation.
Advanced diffusion models beyond the standard tensor model partially mitigated FA bias caused by partial voluming.

Conclusions:

Scan time constraints necessitate careful optimization of spatial and angular resolution in DW-MRI.
Higher angular resolution generally improves data quality, but spatial resolution impacts partial voluming.
Beyond-tensor models offer a promising approach to address biases in diffusion measure estimation, particularly FA.