Hi Lijie, we have a default surface template that we use. When you create an average subject from a group, a template based on those subjects is created at the same time. This can be used as a registration target. doug
On 3/31/11 9:03 PM, soft.join Huang wrote:
Thanks for your reply, Douglas. I also have something unclear, that which target is used when we register one subject's surface to a 'template', a default surface in the FreeSurfer or something else, like one surface selected randomly from my specified subjects. Best Regards, Lijie Huang
On Fri, Apr 1, 2011 at 5:34 AM, Douglas N Greve <greve@nmr.mgh.harvard.edu mailto:greve@nmr.mgh.harvard.edu> wrote:
Hi Lijie, yes, for the volume averages that is the process (uses the linear 12 DOF registration to the MNI305). For surfaces, the average surfaces are created based on the non-linear surface transformation (not from the average volume). doug soft.join Huang wrote: Hi all: Recently, I have a question about some details of the function make_average_subject, which creates some average surfaces and volumes based on the specified subjects' files. And I'm wondering how it make an average one. In my opinion, every specified subject's volume and surface register to a existed template( something like fsaverage) and we can acquire a transform matrix or something like it. According to the transformation, we can register them roughly. And then we can average them to a mean one. I don't know whether my thought right or not. Can anyone give me some tips? :) Thanks in advance Lijie Huang ------------------------------------------------------------------------ _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu <mailto:Freesurfer@nmr.mgh.harvard.edu> https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer -- Douglas N. Greve, Ph.D. MGH-NMR Center greve@nmr.mgh.harvard.edu <mailto:greve@nmr.mgh.harvard.edu> Phone Number: 617-724-2358 Fax: 617-726-7422 Bugs: surfer.nmr.mgh.harvard.edu/fswiki/BugReporting <http://surfer.nmr.mgh.harvard.edu/fswiki/BugReporting> FileDrop: www.nmr.mgh.harvard.edu/facility/filedrop/index.html <http://www.nmr.mgh.harvard.edu/facility/filedrop/index.html> 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.
Ah, I think I got the point. Thank you for your quick reply. :)
Lijie Huang
On Fri, Apr 1, 2011 at 10:26 AM, Douglas Greve greve@nmr.mgh.harvard.eduwrote:
Hi Lijie, we have a default surface template that we use. When you create an average subject from a group, a template based on those subjects is created at the same time. This can be used as a registration target. doug
On 3/31/11 9:03 PM, soft.join Huang wrote:
Thanks for your reply, Douglas. I also have something unclear, that which target is used when we register one subject's surface to a 'template', a default surface in the FreeSurfer or something else, like one surface selected randomly from my specified subjects.
Best Regards, Lijie Huang
On Fri, Apr 1, 2011 at 5:34 AM, Douglas N Greve <greve@nmr.mgh.harvard.edu
wrote:
Hi Lijie, yes, for the volume averages that is the process (uses the linear 12 DOF registration to the MNI305). For surfaces, the average surfaces are created based on the non-linear surface transformation (not from the average volume). doug
soft.join Huang wrote:
Hi all: Recently, I have a question about some details of the function make_average_subject, which creates some average surfaces and volumes based on the specified subjects' files. And I'm wondering how it make an average one. In my opinion, every specified subject's volume and surface register to a existed template( something like fsaverage) and we can acquire a transform matrix or something like it. According to the transformation, we can register them roughly. And then we can average them to a mean one. I don't know whether my thought right or not. Can anyone give me some tips? :) Thanks in advance Lijie Huang
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-- Douglas N. Greve, Ph.D. MGH-NMR Center greve@nmr.mgh.harvard.edu Phone Number: 617-724-2358 Fax: 617-726-7422
Bugs: surfer.nmr.mgh.harvard.edu/fswiki/BugReporting FileDrop: www.nmr.mgh.harvard.edu/facility/filedrop/index.html
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.
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Douglas Greve -
soft.join Huang