<html><head></head><body><div style="font-family: Verdana;font-size: 12.0px;"><div>Dear Fieldtrippers,</div>
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<div>I am attempting to do source reconstruction with Fieldtrip for the first time. I have EEG data but no MRI, just measurements of the electrode positions (with Zebris). However, I got already stuck at creating the forward model.</div>
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<div>Do I need to prepare my own sourcemodel with ft_prepare_sourcemodel or can I use the default options in ft_prepare_leadfield?</div>
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<div>All tutorials for creating a headmodel use an MRI, how can I do it without MRI images of my subjects?</div>
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<div>I have tried to use ft_prepare_headmodel with</div>
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<pre><span style="font-size:12px;"><span style="font-family: Courier New, Courier, monospace;">headmodel = ft_prepare_headmodel(cfg, elec) with the output of <a href="http://www.fieldtriptoolbox.org/reference/ft_read_sens"><font color="green">FT_READ_SENS </font></a>headmo</span></span></pre>
<div><span style="font-size:12px;"><span style="font-family: Courier New, Courier, monospace;">elec =</span></span></div>
<div><span style="font-size:12px;"><span style="font-family: Courier New, Courier, monospace;"> chanpos: [62x3 double]<br/>
elecpos: [62x3 double]<br/>
label: {62x1 cell}<br/>
type: 'eeg1005'<br/>
unit: 'mm'</span></span></div>
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<div>Unfortunately, it first told me: <span style="color:#ff0000;">Either a segmentated MRI or data with closed triangulated mesh is required as data<br/>
input for the bemcp, dipoli or openmeeg method</span>, and when I tried other methods, I got: <span style="color:#ff0000;">The data input might already be a sensor description. Reference to non-existent field 'outputfile'</span></div>
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<div>I would be thankful for tips on how to do this!</div>
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<div>Best,</div>
<div>Sophia</div>
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