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<p class="MsoNormal" style="margin-bottom:12.0pt"><span lang="EN-US">Dear all,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">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>
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>
There seems to be a few lines missing. These lines are:<o:p></o:p></span></p>
<p class="MsoNormal"><i><span lang="EN-US"> if isfield(sens, 'tra')<o:p></o:p></span></i></p>
<p class="MsoNormal"><i><span lang="EN-US"> % construct the channels from a linear combination of all magnetometer coils<o:p></o:p></span></i></p>
<p class="MsoNormal"><i><span lang="EN-US"> lf = sens.tra * lf;<o:p></o:p></span></i></p>
<p class="MsoNormal"><i><span lang="EN-US"> end<o:p></o:p></span></i></p>
<p class="MsoNormal"><span lang="EN-US">These lines are present in the code for other headmodel types and convert lf per coil to lf per sensor.<br>
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>
<br>
My suggestion is to include the aforementioned lines in ft_compute_leadfield. Please let me know what you think!<br>
<br>
Kind regards,<br>
<br>
Bram Knipscheer<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
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