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Related Experiment Video

Updated: Jun 6, 2026

DTI of the Visual Pathway - White Matter Tracts and Cerebral Lesions
10:05

DTI of the Visual Pathway - White Matter Tracts and Cerebral Lesions

Published on: August 26, 2014

The average pathlength map: a diffusion MRI tractography-derived index for studying brain pathology.

Kerstin Pannek1, Jane L Mathias, Erin D Bigler

  • 1The University of Queensland, Centre for Clinical Research, Brisbane, Australia.

Neuroimage
|December 15, 2010
PubMed
Summary

This study introduces the Average Pathlength Map (APM), an automated method for analyzing white matter streamline length in the whole brain. The APM offers a reproducible and precise way to assess brain injury, outperforming traditional region-of-interest methods.

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Related Experiment Videos

Last Updated: Jun 6, 2026

DTI of the Visual Pathway - White Matter Tracts and Cerebral Lesions
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Published on: August 26, 2014

Measuring Connectivity in the Primary Visual Pathway in Human Albinism Using Diffusion Tensor Imaging and Tractography
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Co-analysis of Brain Structure and Function using fMRI and Diffusion-weighted Imaging
17:06

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

Published on: November 8, 2012

Area of Science:

  • Neuroimaging
  • Neuroscience
  • Medical Physics

Background:

  • Magnetic resonance diffusion tractography assesses white matter architecture in vivo.
  • Quantitative metrics like streamline length aid in studying brain pathology.
  • Current methods rely on manual region delineation and prior knowledge of affected tracts.

Purpose of the Study:

  • To present a fully automated, voxel-wise technique for analyzing streamline length across the entire brain.
  • To establish the precision, reproducibility, and normal variability of the Average Pathlength Map (APM).
  • To demonstrate the APM's utility in identifying white matter alterations in traumatic brain injury (TBI).

Main Methods:

  • Development of the Average Pathlength Map (APM) for voxel-wise streamline length analysis.
  • Assessment of reproducibility and normal variability in 43 healthy participants.
  • Voxel-wise comparison of pathlength values between a severe TBI patient and controls.

Main Results:

  • Voxel-wise average pathlength values demonstrate reproducibility and variability comparable to fractional anisotropy (FA).
  • Significant reductions in streamline pathlength were observed in the TBI patient's genu of the corpus callosum and frontal lobe projections.
  • The APM successfully identified white matter alterations in the TBI patient.

Conclusions:

  • The Average Pathlength Map (APM) enables voxel-based analysis of quantitative tractography metrics throughout the whole brain.
  • This automated approach eliminates the need for a priori tract knowledge and manual region of interest delineation.
  • APM is a valuable tool for assessing white matter integrity and pathology in vivo.