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<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Hi Andria,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">We have been struggling with the same problem, also using a 306-channel Neuromag system. We ended up correcting for the scale difference between
magnetometer and gradiometer signals (i.e. noise 5e-15T vs 5e-13T/m). So we multiplied the signals of the magnetometers and the leadfield values of the magnetometers by a factor 100. This gave us the best result.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Kind regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Nicole<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">Van:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> fieldtrip-bounces@science.ru.nl [mailto:fieldtrip-bounces@science.ru.nl]
<b>Namens </b>Andria Pelentritou<br>
<b>Verzonden:</b> 10 mei 17 1:52<br>
<b>Aan:</b> fieldtrip@science.ru.nl<br>
<b>Onderwerp:</b> [FieldTrip] combining gradiometer/magnetometer sensors - neuromag data<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p>Greetings from Melbourne!<o:p></o:p></p>
<p>We've been using fieldtrip (v-20160801) for a while now and we are having issues when it comes to combining magnetometer and gradiometer MEG sensors types during (LCMV) beamforming for the Elekta Neuromag Triux 306-channel system. Beamforming the magnetometers
or gradiometers separately on auditory evoked data works well, but we cannot successfully combine the two sensor types. We've played with the cfg.coilaccuracy variable as advised in one of the tutorials with no luck as there seem to be no obvious effects on
the output. The documentation provides very little information on the topic.<o:p></o:p></p>
<p>What strategies would you recommend when trying to combine the Neuromag 306-channel system magnetometer/gradiometer data?<o:p></o:p></p>
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<p>Many thanks in advance for your help and many more thanks for releasing such a valuable toolbox!<br>
Warm regards<br>
Andria<o:p></o:p></p>
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