OK, starting from scratch at least gave me a log.txt file that makes more sense (below), but same issue as before (one ROI pair tt.gz files contains tracts of whole brain instead of only the tracts that pass through the 2 rois; as seen in pic) Note. I abbreviated the region and label file (L_DMN_test) to contain only 4 regions while testing.
DSI Studio Jun 2 2021, Fang-Cheng Yeh
source=D:\DICOMOBJ\Test\Sub001.src.gz.odf.gqi.1.25.fib.gz
action=trk
loading D:\DICOMOBJ\Test\Sub001.src.gz.odf.gqi.1.25.fib.gz...
otsu_threshold=0.6
fa_threshold=0
dt_threshold=0.2
turning_angle=0
step_size=0
smoothing=0
min_length=30
max_length=300
method=0
initial_dir=0
interpolation=0
seed_plan=0
random_seed=0
check_ending=0
tip_iteration=0
fiber_count=1000000
seed_count=0
thread_count=4
start tracking.
thread_count=4
finished tracking.
1000000 tracts are generated using 2109424 seeds.
0 tracts are removed by pruning.
The final analysis results in 1000000 tracts.
output=no_file
connectivity=L_DMN_test.nii.gz
connectivity_type=pass
connectivity_value=trk
loading L_DMN_test.nii.gz
DWI dimension=(128,128,55)
NIFTI dimension=(128,128,55)
nifti loaded as multiple ROI file
looking for region label file
label file loaded:D:/DICOMOBJ/Test/L_DMN_test.txt
a total of 4 regions are loaded.
connectivity_threshold=0.001
count tracks by passing
calculate matrix using trk
saving L_DMN_1_L_DMN_2.tt.gz
saving L_DMN_1_L_DMN_3.tt.gz
saving L_DMN_1_L_DMN_4.tt.gz
saving L_DMN_2_L_DMN_3.tt.gz
saving L_DMN_2_L_DMN_4.tt.gz
saving L_DMN_3_L_DMN_4.tt.gz