<html><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue-Light, Helvetica Neue Light, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:10pt"><div id="yiv0736859806"><div><div style="color:#000;background-color:#fff;font-family:HelveticaNeue-Light, Helvetica Neue Light, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:10pt;"><div id="yiv0736859806yui_3_16_0_1_1404452127432_18125" style="" class="yiv0736859806">Dear fieldtrip experts,<br class="yiv0736859806" style="">Im trying to do source localization for simulated EEG data, for this I followed the tutorial in page:</div><div id="yiv0736859806yui_3_16_0_1_1404452127432_18130" style="color:rgb(0, 0, 0);font-size:13.3333px;font-family:HelveticaNeue-Light, Helvetica Neue Light, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;background-color:transparent;font-style:normal;" class="yiv0736859806"><a rel="nofollow"
id="yiv0736859806yui_3_16_0_1_1404452127432_18129" style="" class="yiv0736859806" target="_blank" href="http://fieldtrip.fcdonders.nl/tutorial/minimumnormestimate">http://fieldtrip.fcdonders.nl/tutorial/minimumnormestimate</a></div><div id="yiv0736859806yui_3_16_0_1_1404452127432_18131" style="color:rgb(0, 0,
0);font-size:13.3333px;font-family:HelveticaNeue-Light, Helvetica Neue Light, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;background-color:transparent;font-style:normal;" class="yiv0736859806"><br style="" class="yiv0736859806"></div><div id="yiv0736859806yui_3_16_0_1_1404452127432_18132" style="color:rgb(0, 0, 0);font-size:13.3333px;font-family:HelveticaNeue-Light, Helvetica Neue Light, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;background-color:transparent;font-style:normal;" class="yiv0736859806">I was trying to use the mri image provided by fieldtrip (Subject01.mri) and EEG template (standard_1020.elc) in my work.<br style="" class="yiv0736859806">The
mri image need to be re-aliened to the Talairach space for
coregistration with EEG space. In the tutorial you use
(ft_volumerealien) to do that using interactive method.<br style="" class="yiv0736859806">I have two questions:<br style="" class="yiv0736859806"><br style="" class="yiv0736859806">First,
how can I do the coregistration using fixed coordinates of the 3
fiducials (nasion, left pr, right pr), in other words how can I get the
coordinates of the fiducials in both Talairach and EEG spaces to do the
coregistration using the script only not manually.<br style="" class="yiv0736859806"><br style="" class="yiv0736859806">Second,
I
tried to use the mri image provided by the spm toolbox because its
already aliened to Talairach space, but when I try to do segmentation I
get error that coordinates field does not exist:<br style="" class="yiv0736859806"><br style="" class="yiv0736859806">??? Reference to non-existent field 'coordsys'.<br style="" class="yiv0736859806"><br style="" class="yiv0736859806">Error in ==> ft_volumesegment at 284<br style="" class="yiv0736859806"> original.coordsys = mri.coordsys;<br style="" class="yiv0736859806"><br style="" class="yiv0736859806">Error in ==> segmentation_spm_mri at 24<br style="" class="yiv0736859806">seg = ft_volumesegment(cfg, mrirs); <br style="" class="yiv0736859806"><br style="" class="yiv0736859806">I read the image using (ft_read_mri) function, I don't find the field specified for the coordinates:<br style="" class="yiv0736859806"><br style="" class="yiv0736859806">disp(mri)<br style="" class="yiv0736859806"> dim: [177 240 256]<br style=""
class="yiv0736859806"> anatomy: [177x240x256 double]<br style="" class="yiv0736859806"> hdr: [1x1 struct]<br style="" class="yiv0736859806"> transform: [4x4 double]<br style="" class="yiv0736859806"> unit: 'mm'<br style="" class="yiv0736859806"><br style="" class="yiv0736859806">How can I solve this problem so I can use the mri image in SPM for further analysing in fieldtrip?<br style="" class="yiv0736859806"><br style="" class="yiv0736859806">Sorry for the long email I would be thankful for any help.<br style="" class="yiv0736859806">Regards<br style="" class="yiv0736859806">Rasha <br style="" class="yiv0736859806"></div><div style="" class="yiv0736859806" id="yiv0736859806"><div id="yiv0736859806yui_3_16_0_1_1404452127432_18134" style="" class="yiv0736859806"><div
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