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_freeviewclearly >> > 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> >> >> >> >> _______________________________________________ >> >> Freesurfer mailing list >> >> Freesurfer@nmr.mgh.harvard.edu >> >> <mailto:Freesurfer@nmr.mgh.harvard.edu> >> >> https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer >> > >> > The information in this e-mail is intended only for the person to >> > whom it is >> > addressed. If you believe this e-mail was sent to you in error and >> > the e-mail >> > contains patient information, please contact the Partners >> > Compliance HelpLine at >> > http://www.partners.org/complianceline . If the e-mail was sent to >> > you in error >> > but does not contain patient information, please contact the >> > sender and properly >> > dispose of the e-mail. >> > >> > >> > >> > >> > _______________________________________________ >> > Freesurfer mailing list >> > Freesurfer@nmr.mgh.harvard.edu >> > https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer >> >> -- >> Douglas N. Greve, Ph.D. >> MGH-NMR Center >> gr...@nmr.mgh.harvard.edu >> Phone Number: 617-724-2358 >> Fax: 617-726-7422 >> >> Bugs: surfer.nmr.mgh.harvard.edu/fswiki/BugReporting >> FileDrop: https://gate.nmr.mgh.harvard.edu/filedrop2 >> www.nmr.mgh.harvard.edu/facility/filedrop/index.html >> Outgoing: ftp://surfer.nmr.mgh.harvard.edu/transfer/outgoing/flat/greve/ >> >> _______________________________________________ >> Freesurfer mailing list >> Freesurfer@nmr.mgh.harvard.edu >> https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer >> > >
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