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    <p>Hi,</p>
    <p>yes, it's for a current flow of 1A. The origin and coil
      orienations are defined by the header information in the nifti
      (the qform/sform matrices - please keep them identical to avoid
      weird behaviors). It's a 6 DoF transformation between voxel
      indices and real world coordinates (in mm).<br>
    </p>
    <p><br>
    </p>
    <p>Best regards,</p>
    <p>Axel</p>
    <p><br>
    </p>
    <div class="moz-cite-prefix">On 20-05-2022 10:57, Andres Carvallo
      Pecci wrote:<br>
    </div>
    <blockquote type="cite"
cite="mid:1420317107.653702.1653037047817.JavaMail.zimbra@umontpellier.fr">
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        <div>Hello,</div>
        <div><br>
        </div>
        <div>I'm trying to model <span style="color: #000000;
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            text-decoration-thickness: initial; text-decoration-style:
            initial; text-decoration-color: initial; display: inline
            !important; float: none;" data-mce-style="color: #000000;
            font-family: 'sans serif'; font-size: 16px; font-style:
            normal; font-variant-ligatures: normal; font-variant-caps:
            normal; font-weight: 400; letter-spacing: normal; orphans:
            2; text-align: start; text-indent: 0px; text-transform:
            none; white-space: normal; widows: 2; word-spacing: 0px;
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            text-decoration-thickness: initial; text-decoration-style:
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            !important; float: none;">helmoltz-like </span>coil
          (A-field) in matlab and then transfer it to simnibs in the
          form of a compressed Nifti file.</div>
        <div><br>
        </div>
        <div>I did a discretization 2.5 mm as suggested in the
          "Deng_Brain_Stim_2013" document (attached). My questions are
          the following:</div>
        <div><br>
        </div>
        <div>1) The A-field is calculated with a electric current equal
          to 1A?</div>
        <div>2) In the simnibs program, where is the origin coordinate
          with respect to the brain?</div>
        <div><br>
        </div>
        <div>My magnetic exposure is a helmoltz-like coil, stimulating
          the entire brain, but it seems that in my simnibs simulation,
          I am doing something wrong given that the simulated induced
          E-field is localized in Cz.</div>
        <div> <img src="cid:part1.3YNq1A4Q.tjiHlXIQ@drcmr.dk"
data-mce-src="imap://axelt@imap.drcmr.dk:993/fetch%3EUID%3E.INBOX%3E93212?header=quotebody&part=1.1.2.2&filename=Screen%20Shot%202022-05-20%20at%2010.49.21%20AM.png"
            class="" width="382" height="272"><img
            src="cid:part2.xF2gs2KK.GkeE1DBj@drcmr.dk"
data-mce-src="imap://axelt@imap.drcmr.dk:993/fetch%3EUID%3E.INBOX%3E93212?header=quotebody&part=1.1.2.3&filename=Screen%20Shot%202022-05-20%20at%2010.46.39%20AM.png"
            class="" width="241" height="268"></div>
        <div>Thank you for your help.</div>
        <div>Andres </div>
      </div>
      <br>
      <fieldset class="moz-mime-attachment-header"></fieldset>
      <pre class="moz-quote-pre" wrap="">_______________________________________________
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</pre>
    </blockquote>
    <pre class="moz-signature" cols="72">-- 
Dr. Axel Thielscher
Professor of Neurophysics and Neuroimaging
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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