Re: [Freesurfer] Does FS guarantee the same results if run several times?

External Email - Use Caution Hi Xiaojiang, Given the precision of MRI scanners, I would say it's safe to assume that this difference can be ignored. Best, Tim > On April 17, 2020 at 9:02 PM Xiaojiang Yang wrote: > > > External Email - Use Caution > > Thank

Re: [Freesurfer] Does FS guarantee the same results if run several times?

External Email - Use Caution Thank you Douglas! In my case, two runnings were from Centos7 and Redhat7 respectively. Good thing is that the difference of the average thickness is small - it's 0.006 mm. Both lh and rh have 0.006 mm differences, but one's lh is thicker than the

Re: [Freesurfer] Does FS guarantee the same results if run several times?

I think recon-all should be deterministic for multiple threads. I know that different machines can give different answers (but usually this is a mac vs linux thing). On 4/17/2020 2:34 PM, Xiaojiang Yang wrote: External Email - Use Caution Hi Douglas, I checked the recon-all.log

Re: [Freesurfer] Does FS guarantee the same results if run several times?

External Email - Use Caution Hi Douglas, I checked the recon-all.log files for both, and found the difference - my mistake, one used FLAIR as extra input and the other did not. I did find another case that has two different results in two runnings. Both runnings have

Re: [Freesurfer] Does FS guarantee the same results if run several times?

No, it should be giving the same result every time On 4/17/2020 12:03 PM, Xiaojiang Yang wrote: External Email - Use Caution Thank you Douglas and Tashrif! Does this mean I should run recon-all for each subject several times, and compute the average to get the more reliable

Re: [Freesurfer] Does FS guarantee the same results if run several times?

When we run repeated analyses on the same data on the same system, we always get the same results doug On 4/17/2020 11:32 AM, Billah, Tashrif wrote: Hi Xiaojiang and Douglas, I think it is the attribute of having random initialization in the registration steps. This slight discrepancy can

Re: [Freesurfer] Does FS guarantee the same results if run several times?

Can you send the recon-all.log files for two of the runs that should be identical? On 4/17/2020 11:15 AM, Xiaojiang Yang wrote: External Email - Use Caution No. I just checked, they are not identical. Although some of numbers are the same, many are different. Xiaojiang Are the

Re: [Freesurfer] Does FS guarantee the same results if run several times?

External Email - Use Caution Thank you Douglas and Tashrif! Does this mean I should run recon-all for each subject several times, and compute the average to get the more reliable thickness? Can anyone else confirm this? Thanks! Xiaojiang

Re: [Freesurfer] Does FS guarantee the same results if run several times?

Hi Xiaojiang and Douglas, I think it is the attribute of having random initialization in the registration steps. This slight discrepancy can also be observed with antsRegistration. I don't know the exact algorithm FreeSurfer uses for registration though. Best, Tashrif

Re: [Freesurfer] Does FS guarantee the same results if run several times?

External Email - Use Caution No. I just checked, they are not identical. Although some of numbers are the same, many are different. Xiaojiang Are the other results identical? Eg, lh.aparc.stats? On 4/17/2020 10:49 AM, Xiaojiang Yang wrote: External Email

Re: [Freesurfer] Does FS guarantee the same results if run several times?

Are the other results identical? Eg, lh.aparc.stats? On 4/17/2020 10:49 AM, Xiaojiang Yang wrote: External Email - Use Caution Dear Freeserfer developers, I have run recon-all for a bunch of subjects on the same machine for several times. When I use the “mris_anatomical_stats” to

[Freesurfer] Does FS guarantee the same results if run several times?

External Email - Use Caution Dear Freeserfer developers, I have run recon-all for a bunch of subjects on the same machine for several times. When I use the "mris_anatomical_stats" to calculate the statistics (specifically, I am interested in average cortical thickness), I