Tom, <br>In theory SSS method allows to extract signal from the dental work (due to its magnetization) if correction of motion is implemented. MEG SQUIDS can only detect DC magnetic fields if the source is in motion but removing the motion from the raw signal with SSS allows to detected DC signals. I have a reference paper if you are interested. Thanks<br>
<br><div class="gmail_quote">On Tue, Oct 30, 2012 at 5:08 PM, Tom Holroyd (NIH/NIMH) [E] <span dir="ltr"><<a href="mailto:tomh@kurage.nimh.nih.gov" target="_blank">tomh@kurage.nimh.nih.gov</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Just wanted to mention, the "SSS" method separates the signal into "inside" and "outside" the helmet (this is what MaxFilter does). So it is useless for removing dental artifacts.<br>
<br>
McGowin, Inna wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div class="im">
Thank you Jörn for the info.<br>
<br>
I was looking for SSS to perform a DC analysis of MEG data with no motion correction.<br>
We have MEG datasets that are collected from subjects with high magnetic noise such as dental work and/or brain surgery contamination. We wanted to remove the signal that comes from these areas. Do you work with such problems?<br>
<br>
Thanks,<br>
Inna<br>
<br></div><div class="im">
On Tue, Oct 30, 2012 at 5:07 AM, "Jörn M. Horschig" <<a href="mailto:jm.horschig@donders.ru.nl" target="_blank">jm.horschig@donders.ru.nl</a> <mailto:<a href="mailto:jm.horschig@donders.ru.nl" target="_blank">jm.horschig@donders.<u></u>ru.nl</a>>> wrote:<br>
<br>
Dear Inna,<br>
<br>
I'm not aware of any implementation in FieldTrip. For the CTF system<br>
we got the ft_denoise_synthetic function, but afaik SSS is something<br>
NeuroMag specific and (I might be wrong here, because...) since we<br>
do not have a NeuroMag system I would guess that no one bothered to<br>
implement it. If you want to do so, you're welcome and we would be<br>
most happy to help out on various ends with all our abilities ;)<br>
<br>
Best,<br>
Jörn<br>
<br>
<br>
On 10/25/2012 8:33 PM, McGowin, Inna wrote:<br>
</div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div class="im">
Hello,<br>
I would like to know if Signal Space Separation method for MEG<br>
data analysis is available in the FieldTrip toolbox.<br>
<br>
Thanks,<br>
<br>
-- Inna<br>
<br>
<br>
<br>
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-- Jörn M. Horschig<br>
PhD Student<br>
Donders Institute for Brain, Cognition and Behaviour Centre for Cognitive Neuroimaging<br>
Radboud University Nijmegen Neuronal Oscillations Group<br>
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-- <br>
Inna McGowin<br>
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</div></div></blockquote></div><br><br clear="all"><br>-- <br>Inna McGowin<br><br>