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Dear Jung,<br>
<br>
the tranformation was done by coregistering the template MRI head with
the sphere model as explained on this tutorial page <br>
<br>
<a class="moz-txt-link-freetext" href="http://www.sccn.ucsd.edu/eeglab/dipfittut/dipfit.html#topoplot">http://www.sccn.ucsd.edu/eeglab/dipfittut/dipfit.html#topoplot</a><br>
<br>
The transformation is embeded in the function dipplot().<br>
The new DIPFIT2 that will be released (very soon hopefully) has a
function that convert spherical coordinates to closest MNI coordinates
using the following homogenous tranformation matrix.<br>
<br>
besa2SPM = [<br>
0.0101 -0.9400 0 0.5588<br>
1.1889 0.0080 0.0530 -18.0041<br>
-0.0005 -0.0000 1.1268 1.8045<br>
0 0 0 1.0000 ];<br>
<br>
test_spherical_point = [10 10 10]; % sphere radius is 85 mn<br>
<br>
transformed_mni_point = besa2SPM * [test_spherical_point 1]';<br>
transformed_mni_point = transformed_mni_point(1:3)'<br>
<br>
You may then transformed the MNI coordinates to talairach coordinates
using other matlab scripts, for example:<br>
<br>
<a class="moz-txt-link-freetext" href="http://www.mrc-cbu.cam.ac.uk/Imaging/Common/mnispace.shtml">http://www.mrc-cbu.cam.ac.uk/Imaging/Common/mnispace.shtml</a><br>
<pre>containing the short function
function outpoint = aff_mni2tal(inpoint)
Tfrm = [0.88 0 0 -0.8;0 0.97 0 -3.32; 0 0.05 0.88 -0.44;0 0 0 1];
tmp = Tfrm * [inpoint 1]';
outpoint = tmp(1:3)';
or
</pre>
<a class="moz-txt-link-freetext" href="http://godzilla.kennedykrieger.org/sw/mri_toolbox/mri_toolbox/mni2tal.html">http://godzilla.kennedykrieger.org/sw/mri_toolbox/mri_toolbox/mni2tal.html</a><br>
<br>
Hope this helps,<br>
<br>
Arno<br>
<br>
Jung, Ki-Young wrote:
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<p class="MsoNormal"><font face="Arial" size="3"><span
style="font-size: 12pt; font-family: Arial;" lang="EN-US">Dear all<o:p></o:p></span></font></p>
<p class="MsoNormal"><font face="Arial" size="3"><span
style="font-size: 12pt; font-family: Arial;" lang="EN-US">I’d like to
know which method used to do transposition
of the dipoles from the spherical head model to the standard MRI
template in
dipfit function.<o:p></o:p></span></font></p>
<p class="MsoNormal"><font face="Arial" size="3"><span
style="font-size: 12pt; font-family: Arial;" lang="EN-US">Any
references or comments will be welcome.<o:p></o:p></span></font></p>
<p class="MsoNormal"><font face="Arial" size="3"><span
style="font-size: 12pt; font-family: Arial;" lang="EN-US">Many thanks<o:p></o:p></span></font></p>
<p class="MsoNormal"><font face="Arial" size="3"><span
style="font-size: 12pt; font-family: Arial;" lang="EN-US"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font face="바탕" size="2"><span
style="font-size: 10pt;" lang="EN-US">Jung, Ki-Young<o:p></o:p></span></font></p>
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