Featured Citation—ICG during MRI
A study performed BOLD fMRI while simultaneously recording the Electrocardiogram (ECG) and Impedance Cardiogram (ICG) with BIOPAC MRI Smart Amplifiers and accessories. The resolution of the ECG and ICG waveforms was sufficient for measuring stroke volume, cardiac output, pre-ejection period, and left ventricular ejection time during imaging. Results indicate that ICG can be recorded during EPI and, with specific signal processing, can be interpreted similarly as to when recorded outside the MRI. Read more about the technique and results at Psychophysiology:
Cieslak, M., Ryan, W. S., Macy, A., Kelsey, R. M., Cornick, J. E., Verket, M., Blascovich, J. and Grafton, S. (2014), Simultaneous acquisition of functional magnetic resonance images and impedance cardiography. Psychophysiology. doi: 10.1111/psyp.12385
For operation, the NICO100C-MRI typically connects to the MECMRI-NICO Cable/Filter set. This set incorporates 2 meter cable that connects the NICO100C-MRI from the control room to the patch-panel-attached Pi filter, which pokes through to the chamber room where an 8 meter cable connects between the patch panel filter and the subject electrode leads.
A typical setup uses four “Y” electrode lead adapters (CBL204-MRI) that connect to eight carbon composition unshielded electrode leads terminating in Touchproof sockets (LEAD108B and/or LEAD108C) for connection to disposable carbon composition electrodes (EL508, MRI conditional to 7T; the NICO100C-MRI can also function with other electrode types).
Apply skin preparation gel (ELPREP), then clean/dry skin, then apply electrodes. If electrodes appear dry, and assuming electrodes are not hydrogel type, then more conductive gel (GEL100) can be applied.
IMPORTANT: BIOPAC recommends using the shortest possible electrode leads for recording in the fMRI or MRI.