Create folders with unique names of filenames

I am trying to create folders from unique filenames. Here are the files: T001 └── 20000101 ├── 6_3D-MP-RAGE_97.dcm ├── 6_3D-MP-RAGE_98.dcm ├── 5_133_VOLUMES_99027.dcm ├── 5_133_VOLUMES_99028.dcm ├── 5_133_VOLUMES_99029.dcm ├── 5_133_VOLUMES_99030.dcm ├── 4_COR_3D_T1_MPR_1.dcm ├── 4_COR_3D_T1_MPR_107.dcm I want bash magic to result in this: T001 └── 20000101 ├── 6_3D ├── 6_3D-MP-RAGE_97.dcm ├── 6_3D-MP-RAGE_98.dcm ├── 5_133 ├── 5_133_VOLUMES_99027.dcm ├── 5_133_VOLUMES_99028.dcm ├── 5_133_VOLUMES_99029.dcm ├── 5_133_VOLUMES_99030.dcm ├── 4_COR ├── 4_COR_3D_T1_MPR_1.dcm ├── 4_COR_3D_T1_MPR_107.dcm And I have tried this code to extract folder names, but got stuck:

all_patterns=()
for file in sorted/folder/*/*
do
    name=${file##*/}
    pattern=echo ${name} | cut -f1 -d '_'
    all_patterns+=( "$pattern" )
done