Hi Eli, because the "closest" metric isn't symmetric. White-->Pial != pial-->white
cheers Bruce On Tue, 12 Dec 2017, Rockers, Elijah D. wrote: > Hello, > > I was hoping to get some clarification on how exactly the cortical thickness > number is calculated. > In the videos, Doug says it's "the distance between the vertex on the white > to the vertex on the > pial, and you go backwards and forwards to compute the average thickness", > and the 2000 paper says > "the thickness is computed as the average of this distance measured from each > surface to the other". > > From what I understand, You find the closest vertex on the pial surface from > a given white matter > surface vertex, then calculate the distance both ways and take the average. > Why is the value not the > same both ways, i.e., from white to pial, and from pial to white? > > Thanks very much, > Eli > > Houston Methodist. Leading Medicine. > > Houston Methodist is ranked by U.S. News & World Report as the No. 1 hospital > in Texas for patient > care. Houston Methodist is nationally ranked in 8 specialties and is > designated as a Magnet hospital > for excellence in nursing. Visit us at houstonmethodist.org. Follow us at > twitter.com/MethodistHosp > and facebook.com/HoustonMethodist. > > ***CONFIDENTIALITY NOTICE*** This e-mail is the property of Houston Methodist > and/or its relevant > affiliates and may contain restricted and privileged material for the sole > use of the intended > recipient(s). Any review, use, distribution or disclosure by others is > strictly prohibited. If you > are not the intended recipient (or authorized to receive for the recipient), > please contact the > sender and delete all copies of the message. Thank you. > > > _______________________________________________ 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.
