Hi, I am performing FBA using warps generated from ANTS using the instructions: Registration: using transformations generated from other packages I want to apply FOD modulation during this step (which also requires FOD reorientation to be performed as default). However, in the FBA multi shell ana…

[image] Kar: So, can I perform modulation + reorientation while waping the FOD’s and skip this step in my analysis? Yep, that should work. Reorientation can be performed either while warping the FODs, or either subsequently as a direct reorientation of the fixels. Don’t do both though, of c…

This information is difficult for me to interpret, since I don’t know how the visualisation differs from what you expect, and the images have been too heavily compressed so I can’t use the contents of the GUI to assess if there’s anything fundamentally wrong.

Ah! My bad…I hope it’s better this time :stuck_out_tongue_closed_eyes: Basically, I want to visualize significant fixels in FDC (pic 1) as streamlines color coded by percentage effect (pic 2) using the .tsf files for percentage effect & p-value. I would expect to see a percentage decrease in the tra…

Hello all, I am performing FBA (Fibre density and cross-section - Single-tissue CSD) using the intructions: https://mrtrix.readthedocs.io/en/latest/fixel_based_analysis/st_fibre_density_cross-section.html I have 4 subjects, 2 controls, 2 patients: [image] [image] [image] I want to Perform stat…

Hi @PinyiWang , The fixelcfestats can be pretty taxing on your system in terms of CPU usage, but more importantly: memory requirements. As it’s still running at this stage, how is your memory usage (and swap space usage) going on your system? Also, since the memory requirements are so particularly…

Hi @ThijsDhollander Thanks for your response. My system is ubuntu 16.04 on the VMware Workstation, 24GB of memory, 8 CPU, 300GB hard disk space. Maybe that is not enough for the usage of fixelcfestats… Regards, Pinyi Wang

Yes, I’m not 100% sure, but I wouldn’t be surprised if you ran out of memory and the process started swapping. It won’t crash immediately, but it may start to take forever essentially, to either eventually (after a few years; not kidding) finish, or still crash because all the swap space is gone as…

OK, i will check the memory of my system after having it run for 24 hours. Perhaps I should buy a new system… Thanks again for your reply. Regards, Pinyi Wang

[image] PinyiWang: Perhaps I should buy a new system… That’s probably going to end up being the solution indeed. For a typical fixel-based analysis, where you would e.g. have up to 500000 fixels, you need 128GB of RAM to be able to run such a thing. The memory requirements scale roughly qua…

Yes, our computer cluster platform is under construction right now…Hope it can be finished as fast as possible… Anyway, thanks for your advice!!! Regards, Pinyi Wang

No worries; you’re welcome! :wink:

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