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    <p>Dear Kris,</p>
    <p>please see my comments below.</p>
    <p>Best,</p>
    <p>Axel<br>
    </p>
    <div class="moz-cite-prefix">On 1/13/2021 1:21 PM, Kris BAETENS
      wrote:<br>
    </div>
    <blockquote type="cite"
cite="mid:PA4PR01MB7840B5715B0DECA651C7A8CEF5A90@PA4PR01MB7840.eurprd01.prod.exchangelabs.com">
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        <p class="MsoNormal">Dear SimNibs users,<o:p></o:p></p>
        <p class="MsoNormal"><o:p> </o:p></p>
        <p class="MsoNormal"><span lang="EN-GB">I want to compare
            several tDCS montages and assess field strength in
            particular ROI’s, on a “generic” head model, prior to
            actually starting the study. I thought the MNI152 example
            mesh could serve perfectly for this purpose. However, I
            struggle with some very beginner technical issues.<o:p></o:p></span></p>
        <ul style="margin-top:0cm" type="disc">
          <li class="MsoListParagraph"
            style="margin-left:0cm;mso-list:l0 level1 lfo2"><span
              lang="EN-GB">Am I correct in assuming that this mesh is
              already in MNI space?
            </span></li>
        </ul>
      </div>
    </blockquote>
    Yes.<br>
    <blockquote type="cite"
cite="mid:PA4PR01MB7840B5715B0DECA651C7A8CEF5A90@PA4PR01MB7840.eurprd01.prod.exchangelabs.com">
      <div class="WordSection1">
        <ul style="margin-top:0cm" type="disc">
          <li class="MsoListParagraph"
            style="margin-left:0cm;mso-list:l0 level1 lfo2"><span
              lang="EN-GB">“Transform to MNI space” under simulation
              options fails, supposedly because the m2m folder doesn’t
              contain the necessary information?</span></li>
        </ul>
      </div>
    </blockquote>
    As it is already in MNI space, there is no transformation required.
    Just use "Interpolate to a nifti volume" instead.<br>
    <blockquote type="cite"
cite="mid:PA4PR01MB7840B5715B0DECA651C7A8CEF5A90@PA4PR01MB7840.eurprd01.prod.exchangelabs.com">
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        <ul style="margin-top:0cm" type="disc">
          <li class="MsoListParagraph"
            style="margin-left:0cm;mso-list:l0 level1
            lfo2;text-autospace:none">
            <span lang="EN-GB">Similarly, the mni2subject_coords call in
              the example ROI script fails, again, I assume again
              because the m2m folder doesn’t contain the necessary
              information? (I can get it to run without a problem on
              Ernie).</span></li>
        </ul>
      </div>
    </blockquote>
    This call is not needed. Just use the coordinates without any
    transformation.<br>
    <blockquote type="cite"
cite="mid:PA4PR01MB7840B5715B0DECA651C7A8CEF5A90@PA4PR01MB7840.eurprd01.prod.exchangelabs.com">
      <div class="WordSection1">
        <ul style="margin-top:0cm" type="disc">
          <li class="MsoListParagraph"
            style="margin-left:0cm;mso-list:l0 level1 lfo2"><span
              lang="EN-GB">Is it possible to calculate mean field
              strength in an anatomical (e.g., atlas-based) ROI, rather
              than using the sphere-based approach? (I wanted to
              approach this from a “masking” angle, but am unsure how to
              proceed, as I cannot transform the standard head
              simulation to MNI space).</span></li>
        </ul>
      </div>
    </blockquote>
    <p>Yes. The results which you get when using "Interpolate to a nifti
      volume" are already in MNI space, and you can apply any ROI that
      is in MNI space.<br>
    </p>
    <p>Best regards,</p>
    <p>Axel<br>
    </p>
    <blockquote type="cite"
cite="mid:PA4PR01MB7840B5715B0DECA651C7A8CEF5A90@PA4PR01MB7840.eurprd01.prod.exchangelabs.com">
      <div class="WordSection1">
        <p class="MsoListParagraph"><span lang="EN-GB"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span lang="EN-GB">Thank you very much for
            making this wonderful software and also making the tutorials
            publicly available on youtube!<o:p></o:p></span></p>
        <p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span lang="EN-GB">Kind regards,<o:p></o:p></span></p>
        <p class="MsoNormal"><span lang="EN-GB">Kris Baetens<o:p></o:p></span></p>
        <p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
        <p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
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      <pre class="moz-quote-pre" wrap="">_______________________________________________
Simnibs-discuss mailing list
<a class="moz-txt-link-abbreviated" href="mailto:Simnibs-discuss@drcmr.dk">Simnibs-discuss@drcmr.dk</a>
<a class="moz-txt-link-freetext" href="https://mailman.drcmr.dk/mailman/listinfo/simnibs-discuss">https://mailman.drcmr.dk/mailman/listinfo/simnibs-discuss</a>
</pre>
    </blockquote>
    <pre class="moz-signature" cols="72">-- 
Dr. Axel Thielscher
Associate Professor
Danish Research Center for Magnetic Resonance
Copenhagen University Hospital Hvidovre
DK-2650 Hvidovre, Denmark
<a class="moz-txt-link-abbreviated" href="http://www.drcmr.dk">www.drcmr.dk</a>
&
Department of Health Technology
Technical University of Denmark
DK-2800 Kgs. Lyngby
<a class="moz-txt-link-freetext" href="http://www.healthtech.dtu.dk/">http://www.healthtech.dtu.dk/</a></pre>
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