1. Warps

ANTsLongCT starts out by computing the composite warps from individual session images (sub-*_ses-*_desc-preproc_T1w_padscale.nii.gz) to the group template space according to the following steps:

1. Checks to see if the composite warp already exists in the antspriors* directory
2. Copies the composite warp into the directory if it already exists; otherwise, continues
3. Computes the warp from the SST to the group template
4. Finds all of the necessary transforms to concatenate
5. Creates the composite warp from session to group template space using antsApplyTransforms