<div dir="ltr">Dear Hamed,<div><br></div><div><span style="font-family:"Helvetica Neue",Helvetica,Arial,sans-serif;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline">> So, what should I do exactly now? Must I change the head radius from<span> </span></span><b style="font-family:"Helvetica Neue",Helvetica,Arial,sans-serif;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial">106.906</b><span style="font-family:"Helvetica Neue",Helvetica,Arial,sans-serif;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline"><span> </span>to<span> </span></span><b style="font-family:"Helvetica Neue",Helvetica,Arial,sans-serif;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial">85</b><span style="font-family:"Helvetica Neue",Helvetica,Arial,sans-serif;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline"><span> </span>again on the channel location window?<span> </span></span><br><br>No, I think it is just fine.<br>MNI head model is not a perfect sphere, so the concept 'radius' does not exactly hold.</div><div><br></div><div>Makoto<br><br><div class="gmail_quote"><div dir="ltr">On Mon, Jul 9, 2018 at 11:10 AM Hamed Taheri <<a href="mailto:hamedtaheri@yahoo.com">hamedtaheri@yahoo.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div style="font-family:Helvetica Neue,Helvetica,Arial,sans-serif;font-size:13px"><div style="font-family:Helvetica Neue,Helvetica,Arial,sans-serif;font-size:13px"><div><div><span><div>Hello all,</div><div><br></div><div>I have a question regarding channel locations, head radius, and DIPFIT. <br></div><div>Based on Mokoto's preprocessing because my<span> channel montage follows International 10-20 system I select '<span><span>use MNI coordinate file for BEM <u></u>dipfit<u></u> model' and then <span><span>'Opt. head center'</span></span>. After doing these two steps the head radius (<span>Spherical Radius) changed from <span><b>89.2046</b> before <span><span><span><span><span><span>'Opt. head center'</span></span></span></span></span></span> </span>to <b>106.906 </b>after <span><span><span><span><span><span>'Opt. head center'</span></span></span></span></span></span><b>. </b></span></span></span></span><br></div><div>Then I go to DIPFIT head model and setting part, I toggle on the No Co-Reg. But my problem is about a note is written at<span> the end of this window: </span> 'For EEG, check that the channel locations are on the surface of the head model ( To do this: Set head radius to about 85 in the channel editor). <br></div><div>So, what should I do exactly now? Must I change the head radius from <b>106.906</b> to <b>85</b> again on the channel location window? <br></div><div>I would be so thankful if you could help me with this issue.</div><div><br></div>Hame</span>d<br></div><div><br></div><div class="m_7789599932129232076ydp474853e1signature"><div style="font-size:13px"><br></div></div></div></div></div></div>_______________________________________________<br>
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