no, not with any degree of accuracy On Thu, 19 Dec 2013, sujith vijayan wrote:
P.S. I am assuming there is no simple way to get the broadman area and sulcus/gyrus directly from the RAS coordinates. Sujith
On Thu, Dec 19, 2013 at 11:41 AM, sujith vijayan svijayan9@gmail.com wrote: Hi Doug, I am using the registration for subjects with ECoG electrodes. I have the electrode locations in RAS coordinates. I convert the RAS coordinates to talairach coordinates using the mri.nii and talairach.xfm files. I realize that talairach coordinates has some limitations, but I am just looking for ballpark estimates of the electrode locations (gyrus, broadman area). In this context do you think the registration is good enough?
Sujith
On Thu, Dec 19, 2013 at 11:19 AM, Douglas N Greve greve@nmr.mgh.harvard.edu wrote:
It kind of depends on what is going to happen next. The talairach transform is only used in a couple of contexts: to compute the estimated intracranial volume and when doing volume-based analysis of subcortical structures in FS-FAST. It would also be used if you report tal coordinates for the individual (unlikely) or if you create a group average subject (also unlikely). If none of those apply to you, then I would leave it the way it is. If those do apply, then I would improve it. doug On 12/19/2013 10:58 AM, sujith vijayan wrote: > Hi Bruce, > > Thanks! I looked at the other slices and they look similar to the > screenshot I sent you; to my untrained eyes they look like they could > use a slight rotation and shift. I am assuming that means it is a > reasonable registration. > > However, I am not sure how much a talairach registration needs to be > "off" before I need to fix it. The examples at > https://surfer.nmr.mgh.harvard.edu/fswiki/FsTutorial/Talairach_freeview clearly > need fixing. Are there any examples somewhere that show more marginal > cases? > > > Sujith > > > > On Wed, Dec 18, 2013 at 10:21 PM, Bruce Fischl<fischl@nmr.mgh.harvard.edu
mailto:fischl@nmr.mgh.harvard.edu> wrote:
It looks reasonable to me, although you can't tell for
sure from
just one slice Bruce
On Dec 18, 2013, at 5:38 PM, sujith vijayan
<svijayan9@gmail.com
mailto:svijayan9@gmail.com> wrote:
Hi All,
I am wondering whether the talairach registration for one
of my
subjects needs to be fixed. It looks a little off to me,
but I am
not sure from reading the instructions on
https://surfer.nmr.mgh.harvard.edu/fswiki/FsTutorial/Talairach_freeview
whether the degree of difference I am seeing is to be
expected or
not. I've attached a screen shot.
Thanks, Sujith
<Screen Shot 2013-12-18 at 5.31.00 PM.png>
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