[FieldTrip] localspheres

[STEPHAN MORATTI]

I guess you would need headshape points for the local spheres. Not sure if
ft automatically creates a head surface from the segmented MRI.

Best

Stephan
El 05/02/2013 23:25, "Nugent, Allison C. (NIH/NIMH) [E]" <
nugenta at mail.nih.gov> escribió:

>  Hello, ****
>
> ** **
>
> I have what is possibly a naïve question, but I can’t seem to find
> anything on the tutorial pages.****
>
> ** **
>
> I’m trying to create a headmodel using the localspheres method, using the
> output of a segmented MRI.****
>
> ** **
>
> There is a tutorial page for using different types of headmodels, but it
> references ft_prepare_localspheres – which works, but it appears to have
> been deprecated.  When I try this:****
>
> ** **
>
> hdr=ft_read_header(‘mydata.ds’);****
>
> cfg=[];****
>
> cfg.method=’localspheres’;****
>
> cfg.grad=hdr.grad;****
>
> cfg.vol=segmented_mri;****
>
> vol=ft_prepare_headmodel(cfg, segmentedmri);****
>
> ** **
>
> I get an error at ft_getopt(cfg,’tissue’);****
>
> ** **
>
> Although the documentation for ft_prepare_headmodel states that the only
> additional field needed by localspheres is “cfg.grad” it seems that
> cfg.tissue may also be required?  If so, how do I set this – I can’t find
> any documentation that explains.****
>
> ** **
>
> I should note that I’ve run ft_prepare_headmodel successfully using a
> singleshell method.****
>
> ** **
>
> Thanks,****
>
> ** **
>
> Allison****
>
> ** **
>
> Allison Nugent, PhD****
>
> MRI Physicist****
>
> Experimental Therapeutics and Pathophysiology Branch****
>
> NIMH/NIH/DHHS****
>
> Ph. 301-451-8863****
>
> nugenta at mail.nih.gov****
>
> ** **
>
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