[FieldTrip] ECG recording

Jörn M. Horschig jorn at artinis.com
Mon Dec 22 13:23:17 CET 2014

Hi Rajat,


on the FieldTrip wiki is an example page showing one way how to deal with
the heartbeat in MEG recordings. It is very closely related to what Kaelasha
and Ivano proposed:








Jörn M. Horschig, Software Engineer

 <http://www.artinis.com/> Artinis Medical Systems  |  +31 481 350 980 


From: fieldtrip-bounces at science.ru.nl
[mailto:fieldtrip-bounces at science.ru.nl] On Behalf Of Kaelasha Tyler
Sent: Sunday, December 21, 2014 3:42 AM
To: FieldTrip discussion list
Subject: Re: [FieldTrip] ECG recording


Hi Rajat, 


I am using a Neuromag Elekta system. 

Provided I use bioleads to pick up ECG and EOG, when I run an ICA, ECG is
picked up and removed very tidily. 

We use leads above and below each eye (EOG), plus a lead on each wrist (ECG)
and the elbow for ground. 

In this case, running an ICA automatically and clearly picks up EOG and ECG
and these can be removed cleanly.


Previously I was not using bioleads. In that case, I only had data from the
MEG sensors. When I ran the ICA, it was more difficult to identify a clean
ECG component. But it was still possible to see components which were
largely ECG and EOG, and these could be removed. No ideal, but still


If your system allows use of bioleads, use these and run
ft_componentanalysis followed by ft_rejectcomponent on preprocessed data.

If not, just run the ft_componentanalysis and ft_rejectcomponent anyway. ECG
should still be able to be identified.


Hope that helps!






From: fieldtrip-bounces at science.ru.nl
<mailto:fieldtrip-bounces at science.ru.nl>  [fieldtrip-bounces at science.ru.nl]
on behalf of Tyler Grummett [tyler.grummett at flinders.edu.au]
Sent: Sunday, 21 December 2014 10:30 AM
To: FieldTrip discussion list
Subject: Re: [FieldTrip] ECG recording

Hello rajat,


To do the triangle, it's usually left wrist, right wrist and right leg.
However in clinical studies, they use two electrodes: one underneath the
right clavicle and the other roughly five centimetres below the left arm


As for removing it from the signal, the ICA method is your best bet. However
it will be difficult and I'm not 100% you'll be to find a pure ICA component
that contains just ECG activity.


I hope I helped the slightest bit.



On 19 Dec 2014, at 11:31 pm, Rajat Thomas <r.thomas at nin.knaw.nl
<mailto:r.thomas at nin.knaw.nl> > wrote:

Dear FieldTrippers,


I have not been able to find a resource for ECG recording and removal in


What is the best practise in terms of placing the electrodes (and how many)
? Left/Right



Also is there a standard pipeline to remove the ECG from these measurements?


Any pointers would be great.


Thank you.






Rajat Mani Thomas

Social Brain Lab

Netherlands Institute for Neuroscience


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