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Reduction of motion artifacts using a two-frequency impedance plethysmograph and adaptative filtering
Rosell Ferrer, Francisco Javier; Cohen, Kevin P.; Webster, John G.
Universitat Politècnica de Catalunya. Departament d'Enginyeria Electrònica; Universitat Politècnica de Catalunya. IEB - Instrumentació Electrònica i Biomèdica
We measured transthoracic impedance in nine presumed healthy adult subjects with a two-frequency plethysmograph at 57 kHz and 185 kHz. The measurement protocol included periods of normal breathing without motion and periods of motion without breathing. We analyzed the cross-correlation and the ratio between the signals at both frequencies for all the different maneuvers. The correlation coefficient was between 0.97 and 1 for breathing, the minimal cross-correlation (0.81) was for simulated obstructive apnea. We found that the amplitude ratio between the two-frequency signals was different for normal breathing and for motion. Based on these results, we designed and tested an adaptive filter to increase the signal-to-artifact ratio (SAR). The increase in SAR(mean ± standard deviation) compared with the signal at 57 Miz was: 183% ± 117% for arm movement, 133% ± 93% for leg movement, and 34% ± 62% for simulated obstructive apnea.
Peer Reviewed
Àrees temàtiques de la UPC::Enginyeria biomèdica::Electrònica biomèdica
Digital signal processing
Adaptative filters
Bioelectrical phenomena
Biomedical measurement
Electric impedande measurement
Medical signal processing
Motion artifacts reduction
2-frequency impedance plethysmograph
Transthoracic impedance
Helthy adults subjects
Normal breathing
Simulated obstructive apnea
Signal-to-artifact ratio
Leg movement
Arm movement
Processament digital -- Biomedicina

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