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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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): http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3790855/ 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

---

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.

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Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer

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Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer