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<div class="moz-cite-prefix">Dear George,<br>
<br>
for the FEM:<br>
From Johannes (in CC) FieldTrip-SimBio paper<br>
<a class="moz-txt-link-freetext" href="https://biomedical-engineering-online.biomedcentral.com/articles/10.1186/s12938-018-0463-y">https://biomedical-engineering-online.biomedcentral.com/articles/10.1186/s12938-018-0463-y</a><br>
it doesn't get clear if a cortical surface source space or a
volumetric one was used for the dipole scan, I only found<br>
"In the call of <i>ft_prepare_sourcemodel</i>, a grid resolution
of 2 mm was chosen for the source space."<br>
<br>
In general, if you distinguish inner compartments such as white
and grey matter and CSF, I would recommend<br>
to combine it with a cortical surface source space, as done in
most of our papers, see e.g. Section 2.5 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>
<br>
BR<br>
Carsten<br>
<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>
<br>
<br>
Am 03.05.21 um 14:21 schrieb George Buzzell:<br>
</div>
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<p class="MsoNormal"><span style="font-size:11.0pt">Dear FSL
Community,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">For source
localization analyses (using individual MRIs), is there an
established workflow/approach in fieldtrip to model all
aspects of the inside of the head as volumetric (i.e. employ
a FEM model) but restrict the source model (dipole
locations) to a surface-based model of the gray matter (i.e.
using fieldtrip)?
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">My
understanding is that there are two typical workflows for
conducting source localization:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<ol style="margin-top:0in" type="1" start="1">
<li class="MsoListParagraph"
style="margin-left:0in;mso-list:l0 level1 lfo1"><span
style="font-size:11.0pt">Use of a FEM (volumetric) head
model with a volumetric source grid model<o:p></o:p></span></li>
<li class="MsoListParagraph"
style="margin-left:0in;mso-list:l0 level1 lfo1"><span
style="font-size:11.0pt">Use of a BEM (boundary/surface)
head model with a surface-based source model (created via
free-surfer).<o:p></o:p></span></li>
</ol>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">I have
traditionally employed approach #1 above. However, I am
wondering if it is possible to combine a FEM (volumetric)
head model with surface-based modelling of the gray matter
(and dipole locations). My reasoning for wanting to do this
is that I would presume that FEM allows for improved
modelling of the way electricity flows through the internal
media of the head, but, a surface model for dipole locations
would lead to more accurate modeling of their locations and
orientations.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">I would be
grateful for any comments, insights, links to resources
and/or example code. Also, if something is off in the way I
am thinking about this, please do let me know!
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Best,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">George<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<div>
<div>
<p class="MsoNormal"><span style="font-size:11.0pt">-- <o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:9.5pt;font-family:"Arial",sans-serif;color:#202124;letter-spacing:.15pt">George
A. Buzzell<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:9.5pt;font-family:"Arial",sans-serif;color:#202124;letter-spacing:.15pt">Assistant Professor</span><span
style="font-size:11.0pt;font-family:"Arial",sans-serif;color:#202124"><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:9.5pt;font-family:"Arial",sans-serif;color:#202124;letter-spacing:.15pt">Florida
International University<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:9.5pt;font-family:"Arial",sans-serif;color:#202124;letter-spacing:.15pt">Lab
website: <a href="http://www.NDCLab.com"
moz-do-not-send="true"><span style="color:#0563C1">www.NDCLab.com</span></a><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
</div>
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<p class="MsoNormal"><o:p> </o:p></p>
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<br>
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<pre class="moz-quote-pre" wrap="">_______________________________________________
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