[Homer-users] 3-D Digitizer Measurements

[DING, Xiaopan]

Sorry, I have not finished the email and send it out by accident.

If you measured the fiducials with the pen on the scalp, you should apply the same way with the optodes. Otherwise, you could use the dummy optodes when measuring fiducials. Always being consistent. If you use ETG4000, there is an option about whether the adapter is on and off.

Hope it helps.

Xiaopan


> On Sep 18, 2015, at 1:04 PM, DING, Xiaopan <dingxiaopan at gmail.com> wrote:
> 
> Hi Adam,
> 
> Are you using ETG-4000 system? They have an adapter
> 
> On Fri, Sep 18, 2015 at 11:57 AM, Adam Stone <adam.stone at gallaudet.edu <mailto:adam.stone at gallaudet.edu>> wrote:
> Hi all, 
> 
> I was wondering about other labs who use 3-D digitizers (Patriot Polhemus) in their neuroimaging protocols. When taking the measurements with the polhemus pen, do you think it is essential for the optode location measurements be made directly on the scalp? 
> 
> Assuming the origins (Nz, Iz, Cz, AL/AR) are made with the pen on the scalp, would the basic math behind scalp-to-cortical projection still work if optode measurements were made with the pen on the optode, instead of on the scalp itself (where the optode would be)?
> 
> Thanks,
> Adam
> 
> -- 
> Adam Stone
> PhD Candidate, Educational Neuroscience
> Petitto Brain & Language Laboratory for Neuroimaging (BL2)
> Gallaudet University | http://petitto.gallaudet.edu <http://petitto.gallaudet.edu/>
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> 
> -- 
>  
> Xiao Pan Ding Ph.D
> Postdoctoral researcher
> 
> Dr. Eric Jackman Institute of Child Study, University of Toronto
> 
> 45 Walmer Road, Toronto, Ontario, Canada M5R 2X2 
> 
> Email address:  dingxiaopan at gmail.com <mailto:dingxiaopan at gmail.com>
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