[Homer-users] Probabilistic Spatial Resgistration

[Simone Cutini]

Hi Drew,
you might also check the Münster T2T-Converter: 
http://wwwneuro03.uni-muenster.de/ger/t2tconv/
Basically, it allows to obtain the MNI coordinates from 10-20 
measurements (and viceversa).
This is the link to the 3D app: 
http://wwwneuro03.uni-muenster.de/ger/t2tconv/conv3d.html
Note that the results are slightly different from those observed in 
other studies on cranio-cerebral correlation.

Simone


> 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 
> <mailto: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
>         <mailto: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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-- 

Simone Cutini, PhD, Post-doctoral Research Fellow
Department of General Psychology, University of Padova
Via Venezia 8, 35131, Padova, Italy
Tel: +39.049.8276528
Fax: +39.049.8276600
My Profile on Mendeley <http://www.mendeley.com/profiles/simone-cutini/>

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