[FieldTrip] localspheres

[Nugent, Allison C. (NIH/NIMH) [E]]

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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