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<div class="moz-cite-prefix">Dear Ferehste,<br>
<br>
we have implemented the Venant approach for FEM source modeling in
the Fieldtrip-SimBio pipeline.<br>
The Venant approach spreads monopolar sources around the dipole
location in a way that<br>
the dipole location and moment is well approximated. You need to
take care that all these monopoles<br>
are within the grey matter compartment. We call this the "Venant
condition" that has to be fulfilled.<br>
<br>
You find detailed informations in<br>
<a class="moz-txt-link-freetext" href="http://www.sci.utah.edu/~wolters/PaperWolters/2014/VorwerkChoRamppHamerKnoescheWolters_NeuroImage_2014_Webversion.pdf">http://www.sci.utah.edu/~wolters/PaperWolters/2014/VorwerkChoRamppHamerKnoescheWolters_NeuroImage_2014_Webversion.pdf</a><br>
or in Chapter 2.4.2 in<br>
<a class="moz-txt-link-freetext" href="http://www.sci.utah.edu/~wolters/PaperWolters/2016/PursiainenVorwerkWolters_PhysMedBiol_accepted2016_HDiv.pdf">http://www.sci.utah.edu/~wolters/PaperWolters/2016/PursiainenVorwerkWolters_PhysMedBiol_accepted2016_HDiv.pdf</a><br>
or very detailed in <br>
<a class="moz-txt-link-freetext" href="http://www.sci.utah.edu/~wolters/PaperWolters/2016/Vorwerk_Dissertation_2016.pdf">http://www.sci.utah.edu/~wolters/PaperWolters/2016/Vorwerk_Dissertation_2016.pdf</a><br>
<br>
BR<br>
Carsten<br>
<br>
Am 05.11.2017 um 12:05 schrieb Fereshte:<br>
</div>
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cite="mid:CAAdxBZrAAZH+RzJ0SQBJJeEQFF+xtTUsWFb0Qhq33TJ7x+nNgA@mail.gmail.com">
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<div>I'm going to investigate the effect of segmentation on
EEG forward problem( FreeSurfer segmentation and Filedtrip
segmentation). I've already made the FE head model and
placed the electrodes but I'm not really sure how to place
the source models for such a comparison ( like to place
source models where the two segmentations differ in GM).</div>
<div>Thanks for your attention.</div>
</div>
</div>
<div>
<div>
<div><br>
<div class="gmail_quote">
<div>On Sat, Nov 4, 2017 at 11:05 AM Schoffelen, J.M. (Jan
Mathijs) <<a
href="mailto:jan.schoffelen@donders.ru.nl"
target="_blank" moz-do-not-send="true">jan.schoffelen@donders.ru.nl</a>>
wrote:<br>
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Ferehste,
<div><br>
</div>
<div>Your question lacks specificity. I think the
readers of this list need a bit more concrete input
in order to think about answering your question. Is
it about specific locations? Anatomical atlas based
regions-of-interest? What inverse algorithm are you
considering? Etc.?</div>
<div><br>
</div>
<div>Best wishes,</div>
<div><br>
</div>
<div>Jan-Mathijs</div>
<div><br>
</div>
<div>
<div>
<div style="word-wrap:break-word">
<div style="word-wrap:break-word">
<div style="word-wrap:break-word">
J.M.Schoffelen, MD PhD<br>
Senior Researcher, VIDI-fellow - PI,
language in interaction<br>
Telephone: +31-24-3614793</div>
<div style="word-wrap:break-word">
Physical location: room 00.028</div>
<div style="word-wrap:break-word">
Donders Centre for Cognitive Neuroimaging,
Nijmegen, The Netherlands<br>
<br>
<br>
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<div>On 4 Nov 2017, at 07:53, Fereshte <<a
href="mailto:fereshte.ramezani@gmail.com"
target="_blank" moz-do-not-send="true">fereshte.ramezani@gmail.com</a>>
wrote:</div>
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<div>Dear Experts,
<div>I'm so new to fieldtrip so I apologize
if my question is very basic; How can I
place source models in specific locations
according to MRI image ( I've already made
the head model based on FEM). </div>
</div>
<div>Thanks for your attention.</div>
<div>Regards,</div>
<div>Fereshte </div>
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<pre class="moz-signature" cols="72">--
Prof. Dr.rer.nat. Carsten H. Wolters
University of Münster
Institute for Biomagnetism and Biosignalanalysis
Malmedyweg 15
48149 Münster, Germany
Phone:
+49 (0)251 83 56904
+49 (0)251 83 56865 (secr.)
Fax:
+49 (0)251 83 56874
Email: <a class="moz-txt-link-abbreviated" href="mailto:carsten.wolters@uni-muenster.de">carsten.wolters@uni-muenster.de</a>
Web: <a class="moz-txt-link-freetext" href="https://campus.uni-muenster.de/biomag/das-institut/mitarbeiter/carsten-wolters/">https://campus.uni-muenster.de/biomag/das-institut/mitarbeiter/carsten-wolters/</a></pre>
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