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Dear Paolo,<br>
<br>
I experienced similar problems and found that correcting the field
bias in the participant's MRI (e.g. doing a "bias correction" with
SPM) can help. My explanation would be that the field bias either
leads to small inaccuracies in the segmentation and volume which
then "get visible" when warping the grid based on the non-segmented
MRI, or that the warping algorithm itself is affected by this bias.
Maybe you can give that a try!<br>
<br>
Hope this helps,<br>
Britta<br>
<br>
<br>
<br>
<div class="moz-cite-prefix">Am 17.02.2016 um 20:20 schrieb Paolo
Belardinelli:<br>
</div>
<blockquote
cite="mid:CAMa54+OmhxLez60mtDoXcp3M_3PHS1xd-vtbucfWA+76P=HfKQ@mail.gmail.com"
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<div>Dear Fieldtrippers,<br>
we are encountering a problem with a template model for source
reconstruction. In particular, we are warping (non linearly) a
template grid to the individual subject's MRI. <br>
</div>
<div>Doing that, it appears that the very top of the brain is
not fully covered by dipole locations.<br>
</div>
<div>We found that this issue has been already reported:<br>
<br>
<a moz-do-not-send="true"
href="http://www.fieldtriptoolbox.org/template/sourcemodel">http://www.fieldtriptoolbox.org/template/sourcemodel</a>
<br>
</div>
<div>
<div><br>
</div>
<div>Apparently, since March 7th 2013, this issue has been
fixed.<br>
</div>
<div>However we are using August 28th 2015 Fieldtrip version
and we are still dealing with the same issue.<br>
</div>
<div>Any suggestions?<br>
</div>
<div>Here are our code lines:<br>
<br>
cfg = [];<br>
cfg.grid.warpmni = 'yes';<br>
cfg.resolution = 6; % resolution of the template grid in mm<br>
cfg.grid.nonlinear = 'yes'; % use non linear normalization<br>
cfg.mri = mri_spm; % use subject's mri in mni coordinates<br>
cfg.grid.unit = 'mm';<br>
sourcemodel = ft_prepare_sourcemodel(cfg);<br>
<br>
</div>
<div>Thank you in advance.<br>
<br>
</div>
<div>Paolo <br>
</div>
<div><br>
<br>
<br>
<br>
</div>
<div>-- <br>
<div class="gmail_signature">
<div dir="ltr">
<div>--<br>
Paolo Belardinelli, PhD<br>
Neurology Department<br>
University Hospital Tuebingen<br>
Eberhard Karls University Tuebingen<br>
Hoppe-Seyler Str. 3<br>
D-72076 Tuebingen<br>
Tel: <a moz-do-not-send="true" value="+4970712985894">+49
7071 / 29 80478</a><br>
<br>
</div>
</div>
</div>
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<br>
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<pre wrap="">_______________________________________________
fieldtrip mailing list
<a class="moz-txt-link-abbreviated" href="mailto:fieldtrip@donders.ru.nl">fieldtrip@donders.ru.nl</a>
<a class="moz-txt-link-freetext" href="http://mailman.science.ru.nl/mailman/listinfo/fieldtrip">http://mailman.science.ru.nl/mailman/listinfo/fieldtrip</a></pre>
</blockquote>
<br>
<br>
<pre class="moz-signature" cols="72">--
Britta Westner, M.Sc.
Neuroelectromagnetic Oscillations Laboratory
Fachbereich Psychologie
Universität Konstanz
Postfach 905
78457 Konstanz
Telefon: +49-(0)7531-88-5703
Fax: +49-(0)7531-88-5709
<a class="moz-txt-link-abbreviated" href="http://www.psychologie.uni-konstanz.de/nemo-lab">www.psychologie.uni-konstanz.de/nemo-lab</a></pre>
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