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 <svijay...@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
<gr...@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
> <fis...@nmr.mgh.harvard.edu
<mailto:fis...@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
<svijay...@gmail.com
> <mailto:svijay...@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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