Tractography
Tractography - Related Videos
13:26
Measuring Connectivity in the Primary Visual Pathway in Human Albinism Using Diffusion Tensor Imaging and Tractography
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Cited by 5 •
2016
This manuscript describes deterministic and probabilistic algorithms for white matter (WM) reconstruction, used to examine differences in optic radiation (OR) connectivity between albinism and controls. Although probabilistic tractography follows the true course of nerve fibers more closely, deterministic tractography was run to compare the reliability and reproducibility of both techniques.
09:53
Role of Diffusion MRI Tractography in Endoscopic Endonasal Skull Base Surgery
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Cited by 3 •
2021
We present a protocol to integrate diffusion MRI tractography in patient work-up to endoscopic endonasal surgery for a skull base tumor. The methods for adopting these neuroimaging studies in the pre- and intra-operative phases are described.
17:06
Co-analysis of Brain Structure and Function using fMRI and Diffusion-weighted Imaging
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Cited by 17 •
2012
We describe a novel approach for simultaneous analysis of brain function and structure using magnetic resonance imaging (MRI). We assess brain structure with high-resolution diffusion-weighted imaging and white-matter fiber tractography. Unlike standard structural MRI, these techniques allow us to directly relate anatomical connectivity to functional properties of brain networks.
10:27
A Standardized Protocol for Functional Motor Mapping Using Navigated Transcranial Magnetic Stimulation
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2026
Here, we describe a standardized protocol for motor mapping using nTMS combined with diffusion tensor imaging (DTI)-based reconstruction of the corticospinal tract (CST). The protocol is reproducible, clinically feasible, and readily integrable into routine clinical workflows, providing a robust and valuable framework for motor pathway assessment, neuroplasticity research, and rehabilitation planning.
09:33
Diffusion Tensor Magnetic Resonance Imaging in the Analysis of Neurodegenerative Diseases
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Cited by 49 •
2013
Diffusion tensor imaging (DTI) basically serves as an MRI-based tool to identify in vivo the microstructure of the brain and pathological processes due to neurological disorders within the cerebral white matter. DTI-based analyses allow for application to brain diseases both at the group level and in single subject data.
FAQs
Direction-dependent water diffusion provides the measurement needed to infer how white-matter fibers are oriented locally. Computational models analyze diffusion-weighted magnetic resonance data and estimate those orientations within tissue. These estimates allow tractography to represent pathway direction rather than relying only on anatomical appearance, revealing connectivity patterns that conventional scans may not show.
The models first estimate local fiber orientations from the diffusion signal. They then connect compatible orientations across neighboring regions to produce streamlines, which represent reconstructed trajectories. This process transforms voxel-level measurements into a three-dimensional pathway model, allowing investigators to examine how different white-matter regions may be structurally connected.
Defined tracking constraints determine how estimated local orientations can be linked into streamlines. They help guide which trajectory continuations are accepted during reconstruction, so the resulting pathway representation depends not only on the measured diffusion pattern but also on the computational rules used to connect it. This makes the constraints an important part of interpreting the output.
A typical workflow begins with diffusion-weighted magnetic resonance imaging, followed by computational estimation of local fiber orientations. The estimated orientations are then linked according to defined tracking constraints to generate three-dimensional streamlines. The resulting reconstruction can be examined as a representation of white-matter trajectories and structural connectivity for the clinical or research question.
For preoperative planning, tractography can show the spatial relationship between a tumor or other lesion and critical white-matter pathways. This adds connectivity information to conventional anatomical assessment, helping clinicians visualize whether an abnormality lies near reconstructed fiber trajectories. The resulting three-dimensional view can contribute to planning around pathways whose location is clinically important.
Tractography provides structural connectivity information for studying neurological disease, brain injury, and treatment effects. By examining reconstructed white-matter trajectories, investigators can compare how connectivity relates to a condition or changes following an intervention. In medicine, this extends evaluation beyond visible anatomy toward the organization and pathway relationships of the brain’s white matter.