Re: [Freesurfer] Converting single voxel to surface space

2009-09-10 Thread Bruce Fischl
you could just draw dots in the middle of the activated region I guess On Thu, 10 Sep 2009 benjamin.d...@yale.edu wrote: > > Hi, > > The surface I got from MNI152 looks pretty good. > > I had tried to do what you're describing--I made 3x3x3 voxel cubes around > each > peak coordinate in the volu

Re: [Freesurfer] Converting single voxel to surface space

2009-09-09 Thread Donna Dierker
Ben might be using Oliver Lyttelton's mean MNI152 surface (i.e., the average of all 152 subjects' surfaces on the MNI mesh, as registered using CIVET). On 09/09/2009 11:31 AM, Bruce Fischl wrote: > Hi Ben, > > I would be pretty surprised if you can get a reasonable surface from the > MNI152. I

Re: [Freesurfer] Converting single voxel to surface space

2009-09-09 Thread Bruce Fischl
Hi Ben, I would be pretty surprised if you can get a reasonable surface from the MNI152. I would have thought it was too blurry to distinguish many of the gyri from one another. That said, if you do have one, you can make labels in the volume and sample them onto the surface with tksurfer by j

Re: [Freesurfer] Converting single voxel to surface space

2009-09-08 Thread benjamin . deen
Hi, I didn't generated the surface myself (a technician in my lab did), but I imagine it entailed the same process as for a subject, just using the MNI152 brain instead of a single individual's anatomical image. I'm hoping to find the location on this surface of several peak coordinates from pas

Re: [Freesurfer] Converting single voxel to surface space

2009-09-08 Thread Bruce Fischl
Hi Ben, I'm still confused. How do you get a surface from an MNI average? Or is it from the colin dataset? Can you tell us a bit more about what you are trying to do so we can see if we can help? cheers, Bruce On Tue, 8 Sep 2009 benjamin.d...@yale.edu wrote: > > Hi, > > The surface isn't from

Re: [Freesurfer] Converting single voxel to surface space

2009-09-08 Thread benjamin . deen
Hi, The surface isn't from an individual subject, but generated from MNI space itself. What exactly do you mean by sample it onto the surface? I could make an image file with value one at the coordinate of interest and zero elsewhere, and then overlay it on surface space and see where it lies,

Re: [Freesurfer] Converting single voxel to surface space

2009-09-08 Thread Bruce Fischl
Hi Ben, any given MNI coordinate may or may not be on the surface of a subject. You can convert it to individual subject space then sample it onto the surface. cheers, Bruce On Tue, 8 Sep 2009 benjamin.d...@yale.edu wrote: > > Hi, > > I'm wondering how to convert a single voxel coordinate in 2