ECG artifacts in MEG

[Vladimir Litvak]

Dear Andrej,

There is no Matlab function I know of that corrects the sensor data
like in BESA. In SPM8b there is a possibility to discard artefact
sub-space during 3D source reconstruction. This is done using the
'Define spatial confounds' option in MEEGtools toolbox. In principle
if you come up with a montage matrix that projects out your artefact
you can use the montage functionality of SPM to correct your data.
This would be somewhat more distortive than in BESA though and at the
moment I'm not sure whether source analysis of such data would work
correctly in SPM and FT.

Best,

Vladimir

On Thu, Feb 12, 2009 at 2:49 PM, Stancak, Andrej
<A.Stancak at liverpool.ac.uk> wrote:
> Dear colleagues,
>
>  I would like to clean MEG data from ECG artifacts. There is a routine
> artefact_ECG.m enabling to detect the QRS complex in an ECG trace. The question
> is whether there is (in FieldTrip or SPM8b) a method similar to the one
> implemented in BESA which takes the template (basically an averaged QRS plus
> interval encompassing the P and the T wave) and subtract it from each MEG (or
> EEG) trace. Compared to ICA, this method works much faster although it
> definitely may alter certain topographical features of MEG.
>
>  Best regards
>  Andrej
>
> Andrej Stancak, PhD.
> Professor for normal physiology
> Senior lecturer in psychology
>
> School of Psychology
> Eleanor Rathbone Building
> Bedford Street South
> L69 7ZA
> Liverpool
> United Kingdom
>
> Phone: 0044 0151 7946951
> E-mail: a.stancak at liverpool.ac.uk (primary)
>         stancak at lf3.cuni.cz (secondary)
>
> Office hours: Mo 10-12, Wed 10-12
>
> ----------------------------------
> The aim of this list is to facilitate the discussion between users of the FieldTrip  toolbox, to share experiences and to discuss new ideas for MEG and EEG analysis. See also http://listserv.surfnet.nl/archives/fieldtrip.html and http://www.ru.nl/fcdonders/fieldtrip.
>
>

----------------------------------
The aim of this list is to facilitate the discussion between users of the FieldTrip  toolbox, to share experiences and to discuss new ideas for MEG and EEG analysis. See also http://listserv.surfnet.nl/archives/fieldtrip.html and http://www.ru.nl/fcdonders/fieldtrip.