Hi Bruce,
I will graetly appreciate if you can help me with the following questiosn:
1).I am not sure what you mean by type of acquisition but going back to my last
question, the only thing I know is that my MRI data contains more
sequences/series (3DAx_T1, 3DSag_T1, Ax_Flair, Ax_PD, Ax_T2, BOLD, DTI_15,
DTI_32). I converted my dicom files from 3DAx_T1 to a NIFTI format and I wonder
why the size of this file is so big (38 MB) while same type of files from
other subjects but converted by somebody else before me, are only around 4.5
MB. Is 38 MB a regular NIFTI size to be used in Freesurfer or will take a long
time for data preprocessing?
2). In the aparc.stats data if the number of vertices is increasing from a
region to another the cortical thickness should also increase?
3). How I can check to make sure my segmentations aparc+aseg, cortical
parcellation and their labelling are correct?
Thank you very much.
Antonella
________________________________
From: Bruce Fischl <fis...@nmr.mgh.harvard.edu>
To: Antonella Kis <ator...@yahoo.com>
Cc: "freesurfer@nmr.mgh.harvard.edu" <freesurfer@nmr.mgh.harvard.edu>
Sent: Friday, July 22, 2011 3:47 PM
Subject: Re: [Freesurfer] Pre-processing issues
Hi Antonella
do you know what the type of acquisition is? That name isn't enough to know for
sure, but it might be.
And yes, you can run more than 1 recon at a time assuming you have enough ram
on your machine. It won't go faster of course unless you have multiple cpus
cheers
Bruce
On Fri, 22 Jul 2011, Antonella Kis wrote:
> Dear Bruce,
>
> I have two more questions for today, please:
> 1). Just to be sure that I understood correct: for my cortical thickness
> studies and also for a group studies analysis I will use only
> the data from the 3DAx_T1series which was converted to a .nii.gz file. Is
> this right?
>
> 2). If I want to shortness the pre-processing time while running the
> recon-all for my subjects, can I run recon-all for three subjects by
> opening three terminals in the same time? Running more subjects in the same
> time will induce more errors for a manual correction or the
> results will be the same with the one while running each subject
> individual/only one terminal at the time.
>
>
> Thank you and have a great weekend.
> Antonella
>
>
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