Dear FSL experts,
I have some questions about the path distribution correction option in probtrackx2. I checked the help manual and found that --pd option is used to do the path distribution correction. After running the script with --pd, I found that new-created fdt_network_matrix and waytotal had no difference with the results produced by the scripts without --pd option. Since my goal was the distribution corrected probabilistic tractography, the results were still the same after adding --pd option because my calculation of probabilistic tractography only depends on fdt_network_matrix and waytotal. In addition, I noticed that there was a change of the fdt_paths.nii.gz file, which means there was a difference between results produced by two scripts.
Would it be possible to explain why I got those results and how path distribution correction actually works? I also attached the script I used at the end of the message.
Thank you very much.
Sincerely,
Yingtian
/usr/local/fsl/bin/probtrackx2 \
--network -x ${save_path}/targets_Power.txt \
-l -c 0.2 -S 2000 \
--steplength=0.5 -P 5000 \
--pd \
--xfm=${pathproc}/${subject}/data_${method}.bedpostX/xfms/standard2diff.mat \
--forcedir --opd -s ${bpx_path}/merged \
-m ${bpx_path}/nodif_brain_mask \
--dir=${save_path} \
--avoid=/cbis/projects/brain/R01DPS/analysis/templates/CSF.nii \
--omatrix1
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