Hello FSL experts,
I am running melodic under the multi-session temporal concatenation mode on a resting-state fMRI dataset of 25 subjects with 164 time samples in each subject data (TR=2.5s). I am trying to perform a group ICA. I did the preprocessing steps (each subject, slice time correction, motion correction etc) and then transformed each subject data onto standard space (Talairach space), in Afni. Then, I created a time concatenated dataset using 3dTcat command in Afni. Brain mask was separately generated.
To run melodic, I first used the following command line
melodic -i concat_fmri_data.nii.gz -m mask.nii.gz --report --Oall
Melodic was running for more than 3 days and the log.txt didnt show convergence, so I reran it with an increased eps value
melodic -i concat_fmri_data.nii.gz -m mask.nii.gz --report --Oall --eps=0.0005
Currently, it shows convergence (took 24 hours), but 'Sorting IC maps' step has been running since last 24 hours too. My workstation has good specifications and single subject melodic runs within 15 to 20 mins.
Here are my questions:
1) Is it normal that temporal concatenation mode takes this long?
2) Is the above mentioned procedure for the usage of the melodic command correct?
Thanks in advance,
Shantanu
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