Results 301 to 310 of about 877,222 (332)
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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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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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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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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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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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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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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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Impedance techniques:Noninvasive prizewinners?
Journal of Cardiovascular Diagnosis and Procedures, 1996Impedance techniques are noninvasive and simple methods for the quantification of fluid volumes in the body. Tissue impedance, determined at multiple frequencies, offers the possibility of detecting total body water and extracellular and intracellular fluid volume.
De Vries, P. M.J.M. +7 more
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