This application note is concerned with the recording of Zygomaticus measures using a pressure pad transducer vs. EMG electrodes during MRI or fMRI investigations. With some MRI protocols, especially those with extensive and rapid gradient switching cycles, it has proven helpful to employ indirect methods of recording facial EMG activity to better isolate periods of activity. BIOPAC has successfully employed a pressure pad transducer to record minute changes in muscle contraction simultaneously with EMG, such as on the Zygomaticus, to obtain a measure of smiling.
The following BIOPAC products were used for this measurement:
MP150WSW data acquisition system with AcqKnowledge
EMG100C electromyogram amplifier module
LEAD110S shielded leads (x2) and LEAD110 lead
EL254S 4 mm Ag-AgCl recording electrodes
Optional MEC110C module extension cable (C-series amplifier to Touchproof)
DA100C general-purpose transducer amplifier
TSD110-MRI pressure pad transducer—consists of TSD160A differential pressure transducer, RX110 sensor, and AFT30-XL tubing.
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