Hi,
I would like to set-up the BIOPAC MP160 in the MRI scanner to record ECG with the AcqKnowledge software.
The MP160 is already equipped with the ECG100C amplifier and does record the cardiac signal; however, the trace is very noisy, despite some filters have been installed in the MRI room.
I would like to know if anyone could help with the following:
1) How do I get a cleaner analogue signal with either a 3-lead ECG or a pulse oximeter (assuming that the subject preparation has been done properly)?
2) How do I read the ECG recorded with AcqKnowledge in Matlab, so as to detect the R-peaks?
3) How do I send triggers with Matlab in order to mark the ECG trace and know exactly when a (visual) stimulus was presented?
Any help will be much appreciated, especially on how to connect the hardware so that the MP160 could be interfaced with the computer running Matlab.
Many thanks,
V
Dear Saurabh Ranjan,
We haven't looked into that. Can you tell me more about it?
Will Spike2 allow the online noise-free detection of ECG's R-peaks?
I guess the Spike2 works more or less like AcqKnowledge...
The issues we're having depend on the scanning process. Each time a slice is acquired, we record the MRI noise (big spikes).
Please, see the attached picture and bear in mind that not all the peaks you see on the top channel are R-peaks! Most of the spikes are actually MRI artefacts, which look like R-peaks!
P.S..: from top to bottom, the channels depicted are: analogue ECG (bright red), R-peaks markers (blue), digitally-filtered ECG (dark red).
The blue markers are sent each time the analogue ECG signal exceeds a user-defined threshold.
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