[Homer-users] Probabilistic Spatial Resgistration

[Drew Halliday]

Hi Austin,

Thanks for your reply.  I had indeed seen those slides from Ippeida Dan,
but had glazed over the MNI table -- Thanks!  I guess it would be fairly
straight forward to put together a spreadsheet that computes 10-20 based on
distance measurements.

Cheers,
Drew

On Mon, Feb 4, 2013 at 11:57 AM, austin1 <astoudenmire at earthlink.net> wrote:

>  Drew
>
>
>
> Dunno if you've seen this site:
>
> http://www.jichi.ac.jp/brainlab/download/fNIRS_Course_Dan.pdf
>
> but it might help some.
>
> Also, to compute 10-20 sites from distances (nasion-inion, etc.), it would
> just be a matter of percents from one to the other.
>
> Then the reference above gives a chart on one of the slides that shows
> 10-20 to MNI conversion.
>
> Is this something on the order of what you're looking for?
>
>
>
> Austin
>
>
> -----Original Message-----
> From: Drew Halliday **
> Sent: Feb 1, 2013 5:07 PM
> To: homer-users at nmr.mgh.harvard.edu
> Subject: [Homer-users] Probabilistic Spatial Resgistration
>
> Hello NIRS community,
>
>
>
> Has anyone successfully used gross anatomical landmarks (e.g., nasion,
> inion, left and right preauriculars) to computer probabilistic spatial
> registration using either Homer 2, or another program (e.g., fNRI Tools
> from Ippedia Dan’s group)? My understanding is that this can be done
> without MRI or 3D Digitizer data, however the disconnect for me is in
> computing 10-20 or MNI coordinates based simply on distances from
> nasion-inion, left-right preauriculars, and other combinations of distances
> between these landmarks.
>
>
>
> As the AltasViewer GUI in Homer 2 is not yet available, I have been using
> fNRI Tools, and to a lesser extent NIRS_SPM.  An ‘origin’ and ‘others’
> spreadsheet (.csv) are called during this process, however these
> spreadsheets contain x, y and z axis coordinates, presumably computed using
> either 3D digitizer data, MRI scans, or gross anatomical measurements.
>
>
>
> Does anyone know how to use a probe geometry file, combined with gross
> anatomical measurements, and produce said origin and others spreadsheets?
> All thoughts are welcomed!
>
>
>
> Thanks,
>
> Drew
>
>
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