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Title:
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Reduction of motion artifacts using a two-frequency impedance plethysmograph and adaptative filtering
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Author:
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Rosell Ferrer, Francisco Javier; Cohen, Kevin P.; Webster, John G.
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Other authors:
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Universitat Politècnica de Catalunya. Departament d'Enginyeria Electrònica; Universitat Politècnica de Catalunya. IEB - Instrumentació Electrònica i Biomèdica |
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Abstract:
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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. |
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Abstract:
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Peer Reviewed |
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Subject(s):
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-Àrees temàtiques de la UPC::Enginyeria biomèdica::Electrònica biomèdica
-Electrodiagnosis
-Digital signal processing
-Adaptative filters
-Bioelectrical phenomena
-Biomechanics
-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
-Electrodiagnòstic
-Processament digital -- Biomedicina |
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Rights:
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Document type:
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Article |
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Published by:
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IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
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