<div dir="ltr"><div class="gmail_extra"><div class="gmail_quote"><div>Hello Leo,</div><div><br></div><div>This looks like the same problem I was having a few months ago, and there should be some messages on the list about it. I am not able to look at my data and scripts right now, but if I remember correctly (you can check the lists for more) the problem had to do with the transformation matrix, and ft_convert_units. In my case, during the "volume conduction model" step of the tutorial (the last step before you can plot the vol and sourcespace together), I had to add an extra</div>
<div><br></div><div><div>vol = ft_convert_units(vol, 'cm')</div></div><div><br></div><div>before ft_transform_geometry. I don't remember if this alone will solve the problem (unfortunately the the situation is kind of complicated right now, there is also a different version of the minimum norms tutorial that is still in development--see the previous messages for links--and I think my processing pipeline ended up being a mixture of the two to get things working. Which means that it's hard to track where exactly I solved the problem.)</div>
<div><br></div><div>Best,</div><div>Steve</div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">
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Message: 1<br>
Date: Sat, 28 Sep 2013 15:25:32 +0200<br>
From: Zizlsperger Leopold <<a href="mailto:zizlsperger@gmail.com">zizlsperger@gmail.com</a>><br>
To: <<a href="mailto:fieldtrip@science.ru.nl">fieldtrip@science.ru.nl</a>><br>
Subject: [FieldTrip] EEG Source reconstruction: sourcespace and the<br>
volume conductor misaligned<br>
Message-ID: <<a href="mailto:06D14B0C-655A-4EF2-A69A-B735DBDBC504@gmail.com">06D14B0C-655A-4EF2-A69A-B735DBDBC504@gmail.com</a>><br>
Content-Type: text/plain; charset="iso-8859-1"<br>
<br>
Hi all,<br>
I am following the instructions in the "Source reconstruction of event-related fields using minimum-norm estimate" tutorial closely to do a source-analysis of EEG data using the example MRI. As I am following the tutorial almost unchanged I am not including the script here.<br>
<br>
When I re-align the volume conduction model to the sourcespace they are not aligned very well, see screenshot attached. I remember a similar question in the mailing list a while ago but cannot find it...<br>
<br>
Is there a way to interactively realign volume conduction model and sourcespace? Re-doing the fiducials did not change the aligment considerably. Also, my volume conduction model looks weird...<br>
I used ft_determine_coordsys on both the vol and the sourcespace, see screenshots attached, too.<br>
Would be nice if you could point me in the right direction.<br>
Thanks in advance.<br>
Leo<br>
<br>
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<br>
<br>
<br>
<br>
Dr. med. Leopold Zizlsperger<br>
Klinik f?r Neurologie<br>
Uniklinik RWTH Aachen<br>
Pauwelsstrasse 30<br>
52074 Aachen<br>
Tel: <a href="tel:%2B49%20241%2080%2035465" value="+492418035465">+49 241 80 35465</a><br>
<a href="mailto:lzizlsperger@ukaachen.de">lzizlsperger@ukaachen.de</a><br>
<br>
Leopold Zizlsperger, MD<br>
Department of Neurology<br>
RWTH Aachen University<br>
Pauwelsstrasse 30<br>
52074 Aachen, Germany<br>
Tel: <a href="tel:%2B49%20241%2080%2035465" value="+492418035465">+49 241 80 35465</a><br>
<a href="mailto:lzizlsperger@ukaachen.de">lzizlsperger@ukaachen.de</a><br>
<br>
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