[FieldTrip] coregistration question

[jan-mathijs schoffelen]

Ciao Nicola,

What do you mean with 'everything changes (unpredictably) depending on the coordinates of the lpa and rpa.'?
The interpolation of the source-reconstructed results and the visualization of the interpolated results will be wrong if the initial coregistration is wrong to begin with. But this should already show up as a strange topography in the source reconstructed data. 

JM


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> Message: 1
> Date: Tue, 12 Nov 2013 10:28:33 +0000
> From: <Hanneke.vanDijk at med.uni-duesseldorf.de>
> To: <fieldtrip at donders.ru.nl>
> Subject: Re: [FieldTrip] [Fieldtrip] question about coregistration
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> Hi Nicola and Jan-Mathijs,
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> A simple solution can also be to save the points (the fiducials) that you have collected in MRIlab in 'voxel'. After we do the realignment with the polhemus data, we delete all points. We then create points at the final fiducial locations and export these. In this 'Export points' window you can select if you want to save them in head or voxel coordinates. The resulting .txt files can be read in matlab, and you can use them to realign the MRI in fieldtrip.
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> Good luck!
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> Thanks for the info as well, Jan-Mathijs! I didn't know about the two step solution in Fieldtrip, but will certainly give it a try!
> 
> Groetjes Hanneke
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> 
> __________________________________________
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> Hanneke van Dijk, PhD
> http://www.uniklinik-duesseldorf.de/deutsch/unternehmen/institute/KlinNeurowiss/Team/HannekevanDijk/page.html
> Institute for Clinical Neuroscience,
> Heinrich Heine Universit?t D?sseldorf, Germany
> Hanneke.vanDijk at med.uni-duesseldorf.de<mailto:Hanneke.vanDijk at med.uni-duesseldorf.de>
> Tel. +49 (0) 211 81 13074
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> Nicola Molinaro, Phd
> Staff Scientist
> www.bcbl.eu
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Jan-Mathijs Schoffelen, MD PhD 

Donders Institute for Brain, Cognition and Behaviour, 
Centre for Cognitive Neuroimaging,
Radboud University Nijmegen, The Netherlands

Max Planck Institute for Psycholinguistics,
Nijmegen, The Netherlands

J.Schoffelen at donders.ru.nl
Telephone: +31-24-3614793

http://www.hettaligebrein.nl

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