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<p>Hi Steve,</p>
<p>We don't have an optimization procedure for the 4x1 yet. You can
simulate different configurations with the currents you have
specified and read the e-field at the target (and outside the
target if you're interested in focality). Then pick the one that
matches your optimization criteria best. For hitting a target the
best configuration will most likely have the center electrode
directly above the target. The radius of the montage (how far the
surrounding electrodes are) will depend on how deep the target is.
<br>
</p>
<p>The other option is to run the optimization as Axel pointed out
in the previous answer and change the target intensity parameter
so that the optimized currents match the ones you're after as you
say. <br>
</p>
<p>Best,<br>
Oula</p>
<p><br>
</p>
<div class="moz-cite-prefix">On 11/1/22 16:33, Stephen Ball wrote:<br>
</div>
<blockquote type="cite"
cite="mid:LO2P265MB06214E88E07778AAD9A8AB4699369@LO2P265MB0621.GBRP265.PROD.OUTLOOK.COM">
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<p class="MsoNormal">Hi There,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I’m running a study with a similar set-up
to this post: <a
href="https://mailman.drcmr.dk/pipermail/simnibs-discuss/2022-June/000354.html"
moz-do-not-send="true">
[Simnibs-discuss] 4x1 Optamization (drcmr.dk)</a> using a
4x1 hd-tDCS arrangement, with 2mA on the anode and 4 cathodes
at -0.5mA. I’m hoping to optimize the location of these
electrodes. Is there still no optimization setting specific to
this arrangement?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">If not, can I clarify your response in the
link above – are you saying tune the target intensity
parameter and check the output for the arrangement where the
current at each electrode looks closest to what we’re hoping
to achieve?
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Best,<o:p></o:p></p>
<p class="MsoNormal">Steve<o:p></o:p></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Georgia",serif"
lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Georgia",serif"
lang="EN-GB">--------------------------------------------<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Georgia",serif"
lang="EN-GB">Stephen Ball<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:9.0pt;font-family:"Georgia",serif"
lang="EN-GB">--------------------------------------------<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:9.0pt;font-family:"Georgia",serif;color:#7F7F7F"
lang="EN-GB">PhD Student in Cognitive Neuroscience
<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:9.0pt;font-family:"Georgia",serif;color:#7F7F7F"
lang="EN-GB">University of Manchester MRC DTP<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:9.0pt;font-family:"Georgia",serif;color:#7F7F7F"
lang="EN-GB">Division of Neuroscience and Experimental
Psychology (DNEP)<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:9.0pt;font-family:"Georgia",serif;color:#7F7F7F"
lang="EN-GB">Zochonis Building<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:9.0pt;font-family:"Georgia",serif;color:#7F7F7F"
lang="EN-GB"><a class="moz-txt-link-abbreviated" href="mailto:stephen.ball-4@postgrad.manchester.ac.uk">stephen.ball-4@postgrad.manchester.ac.uk</a><o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<br>
<fieldset class="moz-mime-attachment-header"></fieldset>
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