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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" start="1" type="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>
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<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"><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>
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<p class="MsoNormal"><o:p> </o:p></p>
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