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Dear Bram,
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<div class="">This could very well be, it looks as if you have already looked into this. The best way forward would be to send us some small data file (containing a headmodel (i.e. the geometries) and a gradiometer array description, a.k.a. sens) + a few lines
of code that allow us to swiftly reproduce your issue. We could try and whip up something ourselves but we like to delegate :).</div>
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<div class="">Could you file an issue on the fieldtrip github page (<a href="https://github.com/fieldtrip/fieldtrip" class="">https://github.com/fieldtrip/fieldtrip</a>) and send me the data off list (through e-mail if small enough, or otherwise through some
other means)?</div>
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<div class="">Thanks and with best wishes,</div>
<div class="">Jan-Mathijs</div>
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<div class="">On 12 Jan 2021, at 15:34, Knipscheer, B. <<a href="mailto:B.Knipscheer@umcutrecht.nl" class="">B.Knipscheer@umcutrecht.nl</a>> wrote:</div>
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<span lang="EN-US" class="">Dear all,<o:p class=""></o:p></span></p>
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<span lang="EN-US" class="">There seems to be an omission in the ft_compute_leadfield script causing some problems down the line. Can someone check if my observations are correct?<br class="">
In the most recent version of ft_compute_leadfield, when calculating the leadfields for MEG using a headmodel based on OpenMEEG, this is done for the MEG coils and not the sensors.<br class="">
There seems to be a few lines missing. These lines are:<o:p class=""></o:p></span></div>
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<i class=""><span lang="EN-US" class=""> if isfield(sens, 'tra')<o:p class=""></o:p></span></i></div>
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<i class=""><span lang="EN-US" class=""> % construct the channels from a linear combination of all magnetometer coils<o:p class=""></o:p></span></i></div>
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<i class=""><span lang="EN-US" class=""> lf = sens.tra * lf;<o:p class=""></o:p></span></i></div>
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<i class=""><span lang="EN-US" class=""> end<o:p class=""></o:p></span></i></div>
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<span lang="EN-US" class="">These lines are present in the code for other headmodel types and convert lf per coil to lf per sensor.<br class="">
These missing lines subsequently causes the leadfield matrix to be modified in ft_sourceanalysis. Since the number of labels is less than the number of coils, the leadfield matrix is truncated, losing a certain amount of leadfields.<br class="">
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My suggestion is to include the aforementioned lines in ft_compute_leadfield. Please let me know what you think!<br class="">
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Kind regards,<br class="">
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Bram Knipscheer<o:p class=""></o:p></span></div>
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<span lang="EN-US" class=""><o:p class=""> </o:p></span></div>
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<span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;" class="">fieldtrip
mailing list</span><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class="">
<a href="https://mailman.science.ru.nl/mailman/listinfo/fieldtrip" style="font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px;" class="">https://mailman.science.ru.nl/mailman/listinfo/fieldtrip</a><br style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;" class="">
<a href="https://doi.org/10.1371/journal.pcbi.1002202" style="font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px;" class="">https://doi.org/10.1371/journal.pcbi.1002202</a></div>
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