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<p class="MsoNormal">Hi </p>
<p class="MsoNormal">I Just started to use Fieldtrip with my Neuromag MEG data and try to follow<span style="">
</span>the example script</p>
<p class="MsoNormal">‘read_neuromag_mri_and_create_single-subject_grids_in_individual_head_space_that_are_all_aligned_in_mni_space’</p>
<p class="MsoNormal"> </p>
<pre>The instruction suggests to take voxel coordinates of fiduscials from the Neuromag <br>GUI for MRI-MEG Integration. I have already performed this step and saved the <br>transformed mri in the /sets/XXX.fif file.</pre>
<p class="MsoNormal"> </p>
<p class="MsoNormal">Should I write any<span style=""> </span>rpa/nas/lpa coordinates in this case?</p>
<pre>cfg.fiducial.rpa <span style=""> </span>= [y x z]; </pre>
<pre>cfg.fiducial.nas <span style=""> </span>= [y x z]; </pre>
<pre>cfg.fiducial.lpa<span style=""> </span>= [y x z];</pre>
<p class="MsoNormal"> </p>
<p class="MsoNormal">I have 2 4X4 transformations in the .fif file, not sure what they mean.
</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">mri.hdr.trans.trans</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">0.9913<span style=""> </span>0.1210<span style=""> </span>
0.0518<span style=""> </span>-0.0032</p>
<p class="MsoNormal"><span style=""> </span>-0.0948<span style=""> </span>0.9291<span style="">
</span>-0.3574<span style=""> </span>0.0254</p>
<p class="MsoNormal"><span style=""> </span>-0.0914<span style=""> </span>0.3494<span style="">
</span>0.9325<span style=""> </span>-0.0519</p>
<p class="MsoNormal"><span style=""> </span>0<span style=""> </span>
0<span style=""> </span>0<span style=""> </span>1.0000</p>
<p class="MsoNormal">mri.hdr.voxel_trans.trans</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal"><span style=""> </span>-0.0000<span style=""> </span>-0.0000<span style="">
</span>-0.0010<span style=""> </span>0.1058</p>
<p class="MsoNormal"><span style=""> </span>-0.0005<span style=""> </span>0.0000<span style="">
</span>0.0000<span style=""> </span>0.1597</p>
<p class="MsoNormal"><span style=""> </span>0<span style=""> </span>-0.0005<span style="">
</span>0.0001<span style=""> </span>0.1058</p>
<p class="MsoNormal"><span style=""> </span>0<span style=""> </span>
0<span style=""> </span>0<span style=""> </span>1.0000</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">I'll be most grateful for the help! <br>
</p>
<p class="MsoNormal">Regards,<br>
</p>
<p class="MsoNormal">Elena</p>
<pre> </pre>
<pre> </pre>
<p class="MsoNormal"> </p>
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<hr style="width: 100%; height: 2px;">
Elena V Orekhova, Ph.D.<br>
Inst. Neuroscience and Physiology<br>
University of Gothenburg <br>
S-413 45 Gothenburg, Sweden<br>
phone: +46 31 342 48 02<br>
elena@neuro.gu.se</div>
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