No, we will continue to support it

On 10/21/2015 11:13 PM, Mathieu Dubois wrote:
> Hi again,
>
> Another advantage of using qcache in my case is that the file names are
> automatically generated and therefore standard.
>
> Is there any risk (particularly for future compatibility) in using
> qcache? Did anyone had some problem with it?
>
> Thanks in advance,
> Mathieu
>
> Le 21/10/2015 18:07, Mathieu Dubois a écrit :
>> Hi Doug,
>>
>> Thanks for your answer.
>>
>> If I understand correctly, the tutorial describes the use of
>> mris_preproc with a group description file. If the data has not been
>> cached, it will compute them and stack all the results in a big file
>> (will it write individual files?) . Of course if the data has been
>> cached, it will only stack them (this probably result in more disk usage
>> but that's OK).
>>
>> I don't plan to use FreeSurfer's linear model for group analysis (my
>> goal is to use those data in machine learning algorithms) but other
>> people at the institute I work for may be interested in that. I think
>> it's more convenient to have one file per subject (so I can group them
>> in a more flexible way).
>>
>> So I guess I can always run recon-all for each subject with -qcache (I
>> have read that is safe to do so) in order to generate the data for each
>> subject (this can easily be distributed across a cluster and compute
>> several measures). I can then load the data for each subject and people
>> interested into running FreeSurfer group analysis can also use them. Is
>> it correct?
>>
>> My only concern is: will -qcache be supported in future versions of
>> FreeSurfer? Couldn't some part of it (like the resampling on the average
>> subject but no the smoothing) be integrated into -all?
>>
>> Mathieu
>>
>> Le 21/10/2015 16:37, Douglas Greve a écrit :
>>> Hi Mathieu, look at the group analysis tutorial on our wiki. Basically,
>>> you will run mris_preproc, mri_surf2surf to smooth, then mri_glmfit to
>>> do the group analysis, then mri_glmfit-sim to do the correction for
>>> multiple comparisons.
>>> doug
>>>
>>> On 10/21/15 10:15 AM, Mathieu Dubois wrote:
>>>> Hi,
>>>>
>>>> I'm a beginner with freesurfer so I apologize if it's a trivial question.
>>>>
>>>> I recently run recon-all with the -all on many subjects. As far as I can
>>>> say, all the steps worked. However, the measures on the average brain
>>>> (output of mris_preproc and friends) were not computed.
>>>>
>>>> A colleague told me that he usually re-run recon-all with the -qcache
>>>> flag to compute those. This seems to work but I don't understand if it
>>>> is the recommended way to run mris_preproc and why it is not included
>>>> with -all. Is it possible to get those measures in one call to recon-all?
>>>>
>>>> I don't think that the issue comes from the data (e.g. that the failing
>>>> of a step stops some branch of the pipeline) because it seems to run
>>>> correctly with -qcache.
>>>>
>>>> I haven't found any help on -qcache and the help of recon-all doesn't
>>>> mention mris_preproc or mri_surf2surf.
>>>>
>>>> Thanks in advance,
>>>> Mathieu
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>>>>
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-- 
Douglas N. Greve, Ph.D.
MGH-NMR Center
gr...@nmr.mgh.harvard.edu
Phone Number: 617-724-2358
Fax: 617-726-7422

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