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TBSS Step 4: Pre-Statistics

Library: FSL | Docker Image: brainlife/fsl

Function

Projects all subjects FA data onto the mean FA skeleton, ready for voxelwise cross-subject statistics.

Modality: Mean FA skeleton from tbss_3_postreg plus registered FA images.

Typical Use: Final TBSS step before statistical analysis with randomise.

Key Parameters

(FA threshold for skeleton, typically 0.2)

Key Points

Threshold determines which voxels are included in skeleton. Creates all_FA_skeletonised (4D) ready for randomise. Can also project non-FA data (MD, etc.) using tbss_non_FA.

Inputs

Name Type Required Label Flag
threshold double Yes FA threshold for skeleton (e.g., 0.2)
fa_directory Directory Yes FA directory from tbss_3_postreg
stats_directory Directory Yes stats directory from tbss_3_postreg

Outputs

Name Type Glob Pattern
all_FA_skeletonised File stats/all_FA_skeletonised.nii.gz
log File tbss_4_prestats.log

Output Extensions

  • all_FA_skeletonised: .nii.gz

Docker Tags

Available versions: latest, 6.0.4-patched2, 6.0.4-patched, 6.0.4, 6.0.4-xenial, 5.0.11, 6.0.0, 6.0.1, 5.0.9

Categories

  • Diffusion MRI > FSL > TBSS

Documentation

Official Documentation