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IEEE Engineering in Medicine and Biology Magazine

Issue 1 • Date March 1989

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Displaying Results 1 - 10 of 10
  • Biomedical engineering education and technology transfer

    Publication Year: 1989, Page(s):8 - 9
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (261 KB)

    The author examines the role of a biomedical engineering educator in the technology transfer in health care delivery. He identifies the problem as lack of proper communication between the physician and the engineer and suggests ways to remedy it. He discusses the role that the biomedical engineering educator can play in enhancing the acceptability of technological. He concludes that technology tra... View full abstract»

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  • Principles of the impedance technique

    Publication Year: 1989, Page(s):11 - 15
    Cited by:  Papers (24)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (456 KB)

    A simplified treatment of the electrical impedance of biological tissues is presented, examining the sources of impedance changes and the requirements for recording these changes. The author covers small electrodes, simple models, resistivity of blood, the reactive component in bioimpedance, the use of bioadmittance, the use of the finite-element technique and impedance matching.<> View full abstract»

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  • Body fluid determinations using multiple impedance measurements

    Publication Year: 1989, Page(s):16 - 18
    Cited by:  Papers (11)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (257 KB)

    It is shown that a significant potential for error exists when a single measurement from wrist to ankle is used to determine body water volume and percentage of body fat, and that by making measurements of multiple regions of the body (arms, legs, and trunk) a more accurate determination can be obtained. This concept is suggested by the results of multiple impedance measurements made on a group of... View full abstract»

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  • Determination of body fluids by the impedance technique

    Publication Year: 1989, Page(s):19 - 21
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (320 KB)

    For the purposes of determining body composition, the body can be viewed as the sum of two components, fat and fat-free mass, the latter including water, protein, and minerals. Current methods for determining the size of these various components of the body are either inexact, invasive, or dependent on expensive or slow instrumentation. Bioelectrical impedance, which is rapid, noninvasive, and rel... View full abstract»

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  • Cardiac output using the saline-dilution impedance technique

    Publication Year: 1989, Page(s):22 - 26
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (484 KB)

    The author discusses the basis for the indicator-dilution method and illustrates the use of saline to measure cardiac output accurately, along with the technique of electrical calibration of the dilution curve. He considers various indicators, showing why saline is the best for cardiac output measurements. He shows how to calibrate electrically the saline-dilution curve, and he describes two types... View full abstract»

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  • Intracardiac measurements with the impedance technique

    Publication Year: 1989, Page(s):27 - 34
    Cited by:  Papers (5)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (898 KB)

    The author describes how intracardiac volume can be assessed by means of the impedance presented to the passage of an electric current by the blood contained in that volume. It begins with an overview of impedance measurement, and then describes the measurement of cardiac impedance using transventricular electrodes. The calibration of intraventricular blood conductance in absolute volume terms, a ... View full abstract»

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  • Fundamentals of impedance cardiography

    Publication Year: 1989, Page(s):35 - 38
    Cited by:  Papers (29)  |  Patents (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (443 KB)

    The most widely used impedance method for cardiac stroke volume and cardiac output measurements is described. It uses band electrodes around the ends of the thorax and forward extrapolation of the systolic portion of the impedance waveform. Studies performed to determine the physiological origin of the impedance change and the apparently conflicting results are summarized. Comparative studies with... View full abstract»

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  • In vivo imaging of cardiac related impedance changes

    Publication Year: 1989, Page(s):39 - 45
    Cited by:  Papers (12)  |  Patents (21)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1115 KB)

    Electrical impedance tomography (EIT) produces cross-sectional images of the electrical resistivity distribution within the body, made from voltage or current measurements through electrodes attached around the body. The authors describe a gated EIT system to image the cardiogenic electrical resistivity variations and the results of in vivo studies on human subjects. It is shown that the sensitivi... View full abstract»

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  • Impedance tomography and its application in deep venous thrombosis detection

    Publication Year: 1989, Page(s):46 - 49
    Cited by:  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (531 KB)

    The authors have developed an impedance imaging prototype system and tested its functionality. They describe some enhancements made to their previous system and three algorithms for reconstructing impedance images. The system is capable of reconstructing cross-sectional impedance distributions from surface measured data. They discuss some experimental results with the saline tank and a preclinical... View full abstract»

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  • Applications of the impedance technique to the respiratory system

    Publication Year: 1989, Page(s):50 - 52
    Cited by:  Papers (6)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (351 KB)

    The historical background of the use of electrical impedance for respiratory monitoring is sketched, and measurement methods are described. Studies to determine what produces the impedance change are summarized. Some applications are considered.<> View full abstract»

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Aims & Scope

IEEE Engineering in Medicine and Biology Magazine contains articles on current technologies and methods used in biomedical and clinical engineering.

 

This Magazine ceased publication in 2010. The current retitled publication is IEEE Pulse.

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