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EDA / SCR offset calibration for MRI

In some MRI installations, there may be an offset in EDA measurements. The following steps can be performed in order to calibrate skin conductance measurements:

Install all cabling and place the EDA leads in the scanner, where they will be once the participant is there. The connection should be as follows: EDA leads->MRI cabling in chamber room to filter->Filter->MRI cabling from filter in control room->GSR100C amplifier.

The procedure involves performing a 2-point calibration with 2 known conductance values. You can record the voltage corresponding to conductance 0 (open leads) and conductance 10uMho (via placing a 100kOhm resistor between the leads) to calibrate the GSR100C amplifier. The GSR amplifier must be in DC mode (both high-pass filter switches should be set to DC). The following steps will guide you through the procedure.

The amplifier will be calibrated for measurements in the scanner.
IMPORTANT! See Safety Guidelines for recording  biopotential measurements in the MRI environment.

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