Dear Bruce Thanks a lot for the answer.
Regards Jürgen On [DATE], "Bruce Fischl" <[ADDRESS]> wrote: > Hi Jürgen > > in some ways you can think of it as a partial volume correction. We know > the cortex is smooth at the spatial scale of a couple of mm, and so > impose this constraint to estimate the location of the surface with > subvoxel accuracy. In addition, if a given voxel is darker than it's > neighboring gray matter voxels it probably contains more CSF so the surface > should be a bit further in than if the voxel were brighter. > > I hope that helps > Bruce > > > > On Thu, 5 Jan 2012, Jürgen Hänggi wrote: > >> Dear FS experts >> >> We have the following request from one reviewer: >> >> "Provide more detail and more discussion on why the thickness maps produced >> by FreeSurfer are not limited to the voxel resolution of the image. This is >> not obvious to everybody who is not an expert in cortical thickness >> measurements using the free-surfer approach, since it is not so easy to >> comprehend that differences can be found that are beyond the resolution of >> the acquisition." >> >> I can provide the references that provide this statement, but I do not >> really have a sound explanation why this is possible. >> >> Any idea is welcome and appreciated >> >> Thanks in advance >> Jürgen >> >> >> ---------------------------------------------------------------------------- >> Jürgen Hänggi, Ph.D. >> Division Neuropsychology >> Institute of Psychology >> University of Zurich >> Binzmuehlestrasse 14, PO Box 25 >> 8050 Zurich, Switzerland >> 0041 44 635 73 97 (phone office) >> 0041 76 445 86 84 (phone mobile) >> 0041 44 635 74 09 (fax office) >> BIN 4.D.04 (office room number) >> j.haenggi[at]psychologie.uzh.ch (email) >> http://www.psychologie.uzh.ch/neuropsy/ (website) >> http://www.juergenhaenggi.ch (private website) >> >> This e-mail (and any attachment/s) contains confidential and/or privileged >> information. If you are not the intended recipient (or have received this >> e-mail in error) please notify the sender immediately and destroy this >> e-mail. Any unauthorised copying, disclosure or distribution of the >> material in this e-mail is strictly forbidden. >> ---------------------------------------------------------------------------- >> >> >> >> >> _______________________________________________ >> Freesurfer mailing list >> 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. ---------------------------------------------------------------------------- Jürgen Hänggi, Ph.D. Division Neuropsychology Institute of Psychology University of Zurich Binzmuehlestrasse 14, PO Box 25 8050 Zurich, Switzerland 0041 44 635 73 97 (phone office) 0041 76 445 86 84 (phone mobile) 0041 44 635 74 09 (fax office) BIN 4.D.04 (office room number) j.haenggi[at]psychologie.uzh.ch (email) http://www.psychologie.uzh.ch/neuropsy/ (website) http://www.juergenhaenggi.ch (private website) This e-mail (and any attachment/s) contains confidential and/or privileged information. If you are not the intended recipient (or have received this e-mail in error) please notify the sender immediately and destroy this e-mail. Any unauthorised copying, disclosure or distribution of the material in this e-mail is strictly forbidden. ---------------------------------------------------------------------------- _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer
