As a rough approximation, you can fit a sphere to the inner skull surface (created, e.g., by the watershed) as we did in some of the TMS modeling stuff (see, appendix of):
and then scale the result with an approximation of a brain-to-skin distance.
Or you could:
1) Use "mkheadsurf" to create a head surface.
2) Pick two anatomical landmark points such as nasion and inion and use the Dijkstra algorithm to
calculate the length of the shortest path (the Dijkstra may require using the FreeSurfer MATLAB toolbox).
between those points.
-Aapo
On Oct 26, 2015, at 9:45 AM, Bruce Fischl <fischl@nmr.mgh.harvard.edu> wrote:
you could probably generate a skull model from the BEM surface stuff used
in MEG/EEG then find the average radius or something
cheers
Bruce
On Mon, 26 Oct 2015,
dgw wrote:
Hi John,
There is nothing, which I can think of. What do you want the head
circumference for (perhaps we can get you a different measure, which
will help)?
hth
d
On Sat, Oct 24, 2015 at 2:22 PM, John Anderson <j.anderson@publicist.com> wrote:
Dear FS experts,
I want to inquire if there is any tool or method in Freesurfer that can help
to calculate the head circumference from MPRAGE ?
Thanks for any advice!
Bests,
John
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