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¶
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