Results 251 to 260 of about 778,773 (299)
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Psychophysiology, 1978
ABSTRACTThe purpose of this review was to integrate recent evidence supporting the reliability of thoracic impedance plethysmography as an estimator of cardiodynamic function. Reports regarding the development of the method for NASA, and numerous investigations comparing impedance cardiography to indicator dilution and other methods were discussed.
J C, Miller, S M, Horvath
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ABSTRACTThe purpose of this review was to integrate recent evidence supporting the reliability of thoracic impedance plethysmography as an estimator of cardiodynamic function. Reports regarding the development of the method for NASA, and numerous investigations comparing impedance cardiography to indicator dilution and other methods were discussed.
J C, Miller, S M, Horvath
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Equine Veterinary Journal, 1990
Summary The technique of impedance plethysmography is described and its application to observation of lung volume changes in the horse at exercise is discussed. The results from horse at rest show that there is a close relationship between rate of lung volume change (flow rate) and the associated impedance changes during both ...
D P, Attenburrow +2 more
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Summary The technique of impedance plethysmography is described and its application to observation of lung volume changes in the horse at exercise is discussed. The results from horse at rest show that there is a close relationship between rate of lung volume change (flow rate) and the associated impedance changes during both ...
D P, Attenburrow +2 more
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Annals of Biomedical Engineering, 1992
Impedance spectroscopy (IS) is a general term that subsumes the small-signal measurement of the linear electrical response of a material of interest (including electrode effects) and the subsequent analysis of the response to yield useful information about the physicochemical properties of the system.
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Impedance spectroscopy (IS) is a general term that subsumes the small-signal measurement of the linear electrical response of a material of interest (including electrode effects) and the subsequent analysis of the response to yield useful information about the physicochemical properties of the system.
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2011 Conference on Lasers and Electro-Optics Europe and 12th European Quantum Electronics Conference (CLEO EUROPE/EQEC), 2011
Antennas are widely used by electrical engineers to enhance the coupling between propagating waves and electric sources or detectors. It is thus tempting to develop an optical analog to tailor visible light emission or absorption by an atom or a molecule. This idea has been put forward recently [1–4] and it has been demonstrated that both the radiative
Marquier, François +1 more
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Antennas are widely used by electrical engineers to enhance the coupling between propagating waves and electric sources or detectors. It is thus tempting to develop an optical analog to tailor visible light emission or absorption by an atom or a molecule. This idea has been put forward recently [1–4] and it has been demonstrated that both the radiative
Marquier, François +1 more
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Differential impedance plethysmography for measuring thoracic impedances
Medical & Biological Engineering & Computing, 1982A critical evaluation of the measurement of the transthoracic basic impedance Zo according to Kubicek's method revealed inhomogeneous electrical field-distributions in the region of the neck and the shoulders and in the region of the mammae in female subjects. These inhornogeneties were found to introduce uncontrollable errors, like position dependency
J H, Meijer +5 more
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Annals of Otology, Rhinology & Laryngology, 1980
After a review of the development of acoustic impedance measurements, the principles of tympanometry, static compliance and measurements of the middle ear reflexes are described. The interpretation of tympanometry is done by analyzing three essential features: pressure, amplitude and shape.
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After a review of the development of acoustic impedance measurements, the principles of tympanometry, static compliance and measurements of the middle ear reflexes are described. The interpretation of tympanometry is done by analyzing three essential features: pressure, amplitude and shape.
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Imaging the complex impedance in electrical impedance tomography
Clinical Physics and Physiological Measurement, 1992Measuring the reactive component of the bio-impedance enables a full characterisation of the frequency response of a tissue. The amplitude of the reactive component is relatively small in the frequency range generally used in electrical impedance tomography (EIT). Its measurement is therefore more sensitive to errors.
J, Jossinet, C, Trillaud
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Impedance pneumography: Noise as signal in impedance cardiography
Psychophysiology, 1999Thoracic impedance is modulated by events within the respiratory cycle, which represents a source of “noise” in impedance cardiography. Respiration itself, however, is a physiological rhythm of interest to psychophysiologists. We report here methods and validation for deriving impedance pneumographic measures of respiration from impedance cardiography ...
J M, Ernst +4 more
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Nature Methods, 2011
A label-free microscopy technique based on electrochemical impedance offers a new way of studying electrochemical processes in single cells.
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A label-free microscopy technique based on electrochemical impedance offers a new way of studying electrochemical processes in single cells.
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Audiology and Neurotology
Background: Accurate intracochlear positioning of electrode arrays is critical for optimizing auditory outcomes during cochlear implantation (CI). While radiographic imaging remains the standard for postoperative evaluation, transimpedance matrix (TIM) measurements have emerged as a promising intraoperative technique for real-time assessment of ...
Alhassan, Algazlan +5 more
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Background: Accurate intracochlear positioning of electrode arrays is critical for optimizing auditory outcomes during cochlear implantation (CI). While radiographic imaging remains the standard for postoperative evaluation, transimpedance matrix (TIM) measurements have emerged as a promising intraoperative technique for real-time assessment of ...
Alhassan, Algazlan +5 more
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