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Hi Abdul,
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<div class="">What do you mean with ‘ctf is the coordinate system of the sensors’?</div>
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<div class="">For EEG data the ‘ctf’ convention is not a given, because it depends on how the electrodes have been digitized. I would first check the coordinate system’s definition for the EEG electrodes.</div>
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<div class="">Good luck,</div>
<div class="">Jan-Mathijs</div>
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<div class="">On 1 Jun 2024, at 13:23, Anwar, Abdul Rauf via fieldtrip <<a href="mailto:fieldtrip@science.ru.nl" class="">fieldtrip@science.ru.nl</a>> wrote:</div>
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Hi<span class="Apple-converted-space"> </span><br class="">
I am trying to create a headmodel using template MRI and eeg recordings. Given is the piece of code that I have used. Issue is that in the final plot the headmodel and the sensor positions are not properly aligned. Can someone please tell me what part I am
missing here ? ‘ctf’ is the coordinate system of the sensors.<br class="">
Thanks<o:p class=""></o:p></div>
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<o:p class=""> </o:p></div>
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<span style="font-size: 10pt; font-family: Consolas;" class="">ft_defaults<o:p class=""></o:p></span></div>
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<span style="font-size: 10pt; font-family: Consolas;" class="">mri = ft_read_mri(<span style="color: rgb(167, 9, 245);" class="">'C:\ToolBoxes\fieldtrip-20240110\template\anatomy\single_subj_T1.nii'</span>);<o:p class=""></o:p></span></div>
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<span style="font-size: 10pt; font-family: Consolas;" class="">[mri_new] = ft_convert_coordsys(mri,<span class="Apple-converted-space"> </span><span style="color: rgb(167, 9, 245);" class="">'ctf'</span>);<o:p class=""></o:p></span></div>
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<span style="font-size: 10pt; font-family: Consolas;" class="">cfg = [];<o:p class=""></o:p></span></div>
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<span style="font-size: 10pt; font-family: Consolas;" class="">cfg.output =<span class="Apple-converted-space"> </span><span style="color: rgb(167, 9, 245);" class="">'brain'</span>;<o:p class=""></o:p></span></div>
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<span style="font-size: 10pt; font-family: Consolas;" class="">segmentedmri = ft_volumesegment(cfg, mri_new);<o:p class=""></o:p></span></div>
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<span style="font-size: 10pt; font-family: Consolas;" class="">cfg = [];<o:p class=""></o:p></span></div>
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<span style="font-size: 10pt; font-family: Consolas;" class="">cfg.method=<span style="color: rgb(167, 9, 245);" class="">'singleshell'</span>;<o:p class=""></o:p></span></div>
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<span style="font-size: 10pt; font-family: Consolas;" class="">headmodel = ft_prepare_headmodel(cfg, segmentedmri);<o:p class=""></o:p></span></div>
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<span style="font-size: 10pt; font-family: Consolas;" class="">headmodel = ft_convert_units(headmodel,<span class="Apple-converted-space"> </span><span style="color: rgb(167, 9, 245);" class="">'cm'</span>);<o:p class=""></o:p></span></div>
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<span style="font-size: 10pt; font-family: Consolas;" class="">sens = ft_read_sens(<span style="color: rgb(167, 9, 245);" class="">'D:\Data_USB_13052024\Preprocessed_72230\Cleanline_0.1HP_Referenced_PrunedICA_Epoched.set'</span>,<span class="Apple-converted-space"> </span><span style="color: rgb(167, 9, 245);" class="">'senstype'</span>,<span class="Apple-converted-space"> </span><span style="color: rgb(167, 9, 245);" class="">'eeg'</span>);<o:p class=""></o:p></span></div>
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<span style="font-size: 10pt; font-family: Consolas;" class="">sens = ft_convert_units(sens,<span class="Apple-converted-space"> </span><span style="color: rgb(167, 9, 245);" class="">'cm'</span>);<o:p class=""></o:p></span></div>
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<span style="font-size: 10pt; font-family: Consolas;" class="">figure<o:p class=""></o:p></span></div>
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<span style="font-size: 10pt; font-family: Consolas;" class="">ft_plot_sens(sens,<span class="Apple-converted-space"> </span><span style="color: rgb(167, 9, 245);" class="">'style'</span>,<span class="Apple-converted-space"> </span><span style="color: rgb(167, 9, 245);" class="">'*b'</span>);<o:p class=""></o:p></span></div>
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<span style="font-size: 10pt; font-family: Consolas;" class="">hold<span class="Apple-converted-space"> </span><span style="color: rgb(167, 9, 245);" class="">on</span><o:p class=""></o:p></span></div>
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<span style="font-size: 10pt; font-family: Consolas;" class="">ft_plot_headmodel(headmodel);<o:p class=""></o:p></span></div>
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<o:p class=""> </o:p></div>
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<o:p class=""> </o:p></div>
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