title: Noncontact monitoring of cardiorespiratory activity by electromagnetic coupling.
abstract: In this paper, the method of noncontact monitoring of cardiorespiratory activity by electromagnetic coupling with human tissue is investigated. Two measurement modalities were joined: an inductive coupling sensor based on magnetic eddy current induction and a capacitive coupling sensor based on displacement current induction. The system's sensitivity to electric tissue properties and its dependence on motion are analyzed theoretically as well as experimentally for the inductive and capacitive coupling path. The potential of both coupling methods to assess respiration and pulse without contact and a minimum of thoracic wall motion was verified by laboratory experiments. The demonstrator was embedded in a chair to enable recording from the back part of the thorax.
authors.affiliation: Chair of Medical Information Technology, RWTH Aachen University, Aachen 52074, Germany. teichmann@hia.rwthaachen.de
authors.forename: Daniel
authors.initials: D
authors.lastname: Teichmann
authors.forename: Jérôme
authors.initials: J
authors.lastname: Foussier
authors.forename: Jing
authors.initials: J
authors.lastname: Jia
authors.forename: Steffen
authors.initials: S
authors.lastname: Leonhardt
authors.forename: Marian
authors.initials: M
authors.lastname: Walter
mesh_terms: D002307:Cardiography, Impedance / Q000295:instrumentation*; D004574:Electromagnetic Fields; D004867:Equipment Design; D019544:Equipment Failure Analysis; D006339:Heart Rate / Q000502:physiology*; D006801:Humans; D008297:Male; D018670:Monitoring, Ambulatory / Q000295:instrumentation*; D009991:Oscillometry / Q000295:instrumentation*; D015203:Reproducibility of Results; D056152:Respiratory Rate / Q000502:physiology*; D012680:Sensitivity and Specificity; D055815:Young Adult