<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 style="" class=""> </div>Dear fieldtrip experts,<br class="" style=""><div id="yiv6547247487yui_3_16_0_1_1404452127432_18125" style="" class="">Im trying to do source localization for simulated EEG data, for this I followed the tutorial in page:</div><div id="yiv6547247487yui_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=""><a rel="nofollow" id="yiv6547247487yui_3_16_0_1_1404452127432_18129" style="" class="" target="_blank" href="http://fieldtrip.fcdonders.nl/tutorial/minimumnormestimate">http://fieldtrip.fcdonders.nl/tutorial/minimumnormestimate</a></div><div
id="yiv6547247487yui_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=""><br style="" class=""></div>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="">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="">I have two questions:<br style="" class=""><br style="" class="">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=""><br style="" class="">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=""><br style="" class="">??? Reference to non-existent field 'coordsys'.<br style="" class=""><br style="" class="">Error in ==> ft_volumesegment at 284<br style="" class=""> original.coordsys = mri.coordsys;<br style="" class=""><br style="" class="">Error in ==> segmentation_spm_mri at 24<br style="" class="">seg = ft_volumesegment(cfg, mrirs); <br style="" class=""><br style="" class="">I read the image using (ft_read_mri) function, I don't find the field specified for the coordinates:<br style="" class=""><br style="" class="">disp(mri)<br style="" class=""> dim: [177 240 256]<br style="" class=""> anatomy: [177x240x256 double]<br style="" class=""> hdr: [1x1 struct]<br
style="" class=""> transform: [4x4 double]<br style="" class=""> unit: 'mm'<br style="" class=""><br style="" class="">How can I solve this problem so I can use the mri image in SPM for further analysing in fieldtrip?<br style="" class=""><br style="" class="">Sorry for the long email I would be thankful for any help.<br style="" class="">Regards<br style="" class="">Rasha <div style="" class=""><br style="" class=""></div></div></body></html>