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Diffusion derivatives

Diffusion-based tractography

Tractography based on diffusion-weighted MRI data is stored as streamlines in the TRX file format:

<pipeline_name>/
    sub-<label>/
        [ses-<label>/]
            <modality>/
                <source-entities>[space-<space>]_[tract-<tract name>]_[track-<tracking method>]_tractogram.trx
                <source-entities>[space-<space>]_[tract-<tract name>]_[track-<tracking method>]_tractogram.json

Where tract is the anatomical/structural entity that is being imaged, and track uses as its value one of the items in a controlled vocabulary.

For example:


AFQ/
    sub–01/
        dwi/
            sub-01_space-MNI152NLin2009cAsym_tract-wholebrain_track-eudx_tractogram.trx
            sub-01_space-MNI152NLin2009cAsym_tract-wholebrain_track-eudx_tractogram.json
            sub-01_space-MNI152NLin2009cAsym_tract-ArcuateFasciculus_hemi-L_track-eudx_tractogram.trx
            sub-01_space-MNI152NLin2009cAsym_tract-ArcuateFasciculus_hemi-L_track-eudx_tractogram.json