Results 211 to 220 of about 292,872 (251)
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Physics in Medicine and Biology, 2000
We have developed an impedance magnetocardiogram (IMCG) system to detect the change of magnetic field corresponding to changes in blood volume in the heart. A low magnetic field from the electrical activity of the human heart--the so-called magnetocardiogram (MCG)--can be simultaneously detected by using this system.
A, Kandori +4 more
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We have developed an impedance magnetocardiogram (IMCG) system to detect the change of magnetic field corresponding to changes in blood volume in the heart. A low magnetic field from the electrical activity of the human heart--the so-called magnetocardiogram (MCG)--can be simultaneously detected by using this system.
A, Kandori +4 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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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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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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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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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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Electrical Impedance Tomography
Current Opinion in Critical Care, 2009Electrical impedance tomography (EIT) is a noninvasive, radiation-free monitoring tool that allows real-time imaging of ventilation. The purpose of this article is to discuss the fundamentals of EIT and to review the use of EIT in critical care patients.In addition to its established role in describing the distribution of alveolar ventilation, EIT has ...
Eduardo L V, Costa +2 more
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Impedance Planimetry: Clinical Impedance Planimetry
2006Rectal dynamics traditionally have been assessed using the construct of “rectal compliance” measurement, assessing the change in volume with changes in rectal pressure. Various studies have reported “normal control” results over a wide range of measurements (1–7), reflecting the relative lack of reproducibility of the technique where there are ...
Gardiner, Angela B., Duthie, Graeme S.
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