Please remember to post the list and not to us personally. Thanks! Actually, I don't know of a good way to do what you want to do (I thought I had an idea, but it won't work). One way to do this would be to select a random set of vertices. This would be approximately uniform. Alternatively, you can use mris_make_face_parcellation but you will be limited by the icosahedral series. If you want to go with the first option, you can run
mri_volsynth --temp subject/surf/lh.thickness --pdf uniform --o junk.mgh
mri_binarize --i junk.mgh --min .9 --o mask.mgh
The first command synthesizes a surface overlay with uniformly distributed random numbers between 0 and 1. The second command thresholds at .9, so you'd get about 10% of the vertices
doug
On 02/13/2014 02:20 AM, peng wrote:
Hi Douglas,
Thanks for your reply. Yes, I mean "a mask surface overlay with 1s in some vertices and 0s in others". And I also wish to convert there coordinates back to the volume coordinates later (e.g. RAS etc.), which I think is possible.
On Wed, Feb 12, 2014 at 4:15 PM, Douglas Greve <greve@nmr.mgh.harvard.edu mailto:greve@nmr.mgh.harvard.edu> wrote:
what do you mean by "dots"? Eg, a mask surface overlay with 1s in some vertices and 0s in others? Or a label? doug On 2/12/14 9:52 AM, peng wrote:Dear Freesurfers, I have run recon-all and got a set of surfaces for the subjects. I wish to distribute N dots about evenly on the surface to cover most gyri and sulci , but I don't how to implement that. One way is to manually put them in the GUI of freeview, but it is not so convenient if N is relative large (say, 200). Can anyone give me a hint which function shall I use? best Peng _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu <mailto:Freesurfer@nmr.mgh.harvard.edu> https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer_______________________________________________ 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.
Thanks，I will try。
On Thu, Feb 13, 2014 at 9:47 PM, Douglas N Greve greve@nmr.mgh.harvard.eduwrote:
Please remember to post the list and not to us personally. Thanks! Actually, I don't know of a good way to do what you want to do (I thought I had an idea, but it won't work). One way to do this would be to select a random set of vertices. This would be approximately uniform. Alternatively, you can use mris_make_face_parcellation but you will be limited by the icosahedral series. If you want to go with the first option, you can run
mri_volsynth --temp subject/surf/lh.thickness --pdf uniform --o junk.mgh
mri_binarize --i junk.mgh --min .9 --o mask.mgh
The first command synthesizes a surface overlay with uniformly distributed random numbers between 0 and 1. The second command thresholds at .9, so you'd get about 10% of the vertices
doug
On 02/13/2014 02:20 AM, peng wrote:
Hi Douglas,
Thanks for your reply. Yes, I mean "a mask surface overlay with 1s in some vertices and 0s in others". And I also wish to convert there coordinates back to the volume coordinates later (e.g. RAS etc.), which I think is possible.
On Wed, Feb 12, 2014 at 4:15 PM, Douglas Greve <greve@nmr.mgh.harvard.edumailto: greve@nmr.mgh.harvard.edu> wrote:
what do you mean by "dots"? Eg, a mask surface overlay with 1s in some vertices and 0s in others? Or a label? doug On 2/12/14 9:52 AM, peng wrote:Dear Freesurfers, I have run recon-all and got a set of surfaces for the subjects. I wish to distribute N dots about evenly on the surface to cover most gyri and sulci , but I don't how to implement that. One way is to manually put them in the GUI of freeview, but it is not so convenient if N is relative large (say, 200). Can anyone give me a hint which function shall I use? best Peng _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu <mailto:Freesurfer@nmr.mgh.harvard.edu> https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer
_______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu <mailto:Freesurfer@nmr.mgh.harvard.eduhttps://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.-- Douglas N. Greve, Ph.D. MGH-NMR Center greve@nmr.mgh.harvard.edu Phone Number: 617-724-2358 Fax: 617-726-7422
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