[Freesurfer] motioncor

2013-06-02 Thread Gabriel Obregon
Hi, Could someone please help me with the following concerns: A. If I have multiple source volumes in mri/orig/ and run recon-all using the -nomotioncor option, how are these inputs processed compared to the case in which motion correction is employed, and what should I expect as my output? B.

Re: [Freesurfer] Segmentation of MR-PET structurals

2013-06-19 Thread Gabriel Obregon
Hi Douglas, The brainmask volumes are extremely grainy (similar to the raw structurals), i.e., dark voxels throughout the WM and high-intensity voxels across the gray matter. As far as I understood, all WM voxels (unless a lesion is present) should have a uniform intensity distribution after th

[Freesurfer] Basic skullstrip Inquiry

2013-02-12 Thread Gabriel Obregon
Hi, I'm using the -gcut flag for the first time and I've noticed that the skull stripping process is still leaving small fragments of dura behind. Will this affect my surfaces? Should I manually edit the brainmask volume to remove as much of these fragments as I can? Also, should I only be co