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Biomedical Engineering, IEEE Transactions on

Issue 2 • Date Feb. 1983

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Displaying Results 1 - 17 of 17
  • IEEE Transactions on Biomedical Engineering - Table of contents

    Publication Year: 1983 , Page(s): c1
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    Freely Available from IEEE
  • IEEE Engineering in Medicine and Biology Society

    Publication Year: 1983 , Page(s): c2
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    Freely Available from IEEE
  • Dielectric Permittivity and Electrical Conductivity of Fluid Saturated Bone

    Publication Year: 1983 , Page(s): 81 - 86
    Cited by:  Papers (67)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2471 KB)  

    The dielectric permittivity and electrical conductivity of freshly excised and formalin fixed samples of rat femoral bone were determined over a frequency range of 10 Hz-100 MHz. Impedance measurements were performed in the frequency domain using a vector impedance meter and an impedance analyzer. The results of these measurements show that the conductivity of fixed and fresh bone is nearly independent of frequency below 100 kHz, with the conductivity of fresh bone being two to three times greater than that of the fixed sample. At higher frequencies, the conductivity increases as a power function of frequency. The permittivity of bone reaches very high values at low frequencies, but decreases rapidly with increasing frequencies and approaches a limiting value of about ten. This high-frequency limit is consistent with the water content of the tissue, and with the permittivity of the anhydrous matrix. It is suggested that the olarizability observed at audio and radiowave frequencies is in part sssociated with the collagen phase, although other interfacial polarization effects can also be present. View full abstract»

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  • A Microcomputer-Based Heart-Rate Variability Monitor

    Publication Year: 1983 , Page(s): 87 - 93
    Cited by:  Papers (2)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2445 KB)  

    A cost-effective method of on-line measurement of beat-to-beat heart-rate variability is presented. Based on a commercial microcomputer, the data is formatted as a histogram covering up to 500 past events in the form of a moving time window. Analysis of the QRS peak detector used in the instrumentation shows the conditions necessary for 1 ms resolution. The system permits the on-line calculation of statistical parameters, which are presented when a hard copy of the histogram is requested. View full abstract»

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  • Evaluation of Portal/Peripheral Route and of Algorithms for Insulin Delivery in the Closed-Loop Control of Glucose in Diabetes - A Modeling Study

    Publication Year: 1983 , Page(s): 93 - 103
    Cited by:  Papers (25)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (4108 KB)  

    In this paper we present an evaluation of portal versus peripheral routes for insulin delivery in diabetes with three representative closed-loop glucose control algorithms. A novel noninvasive approach is used which is based on a model of the blood glucose regulation system which simulates a Type I diabetic subject. The two routes and three algorithms are compared in controlling the simulated patient for 24 h, challenged with two dynamic glucose perturbations. The evaluation is performed by comparing both plasma accessible variables (e.g., glucose and insulin) and metabolic fluxes (e.g., glucose production and uptake, peripheral glucose utilization). Similar performances are achieved by the three algorithms both with peripheral and with portal infusions, especially in the postabsorptive steady state. An almost complete metabolic normalization is obtained with the portal route. With the peripheral route, normality is not restored; in particular, hyperinsulinemia and enhanced insulin-dependent glucose utilization are produced. From these simulation results, it is the site of insulin infusion, which appears to play an essential role in terms of the ability to normalize the metabolic state of a diabetic subject. View full abstract»

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  • Voltage Clamp Processor System

    Publication Year: 1983 , Page(s): 103 - 110
    Cited by:  Papers (2)
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    A new method of voltage clamping of biological membranes is developed. Usually, series resistance (Rs) is inevitably introduced to the membrane and Rs makes it difficult to control the membrane voltage. The purpose of this study is to compensate undesirable effects of Rs, and to develop an improved voltage clamp system. View full abstract»

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  • Pole-Zero Modeling and Classification of Phonocardiograms

    Publication Year: 1983 , Page(s): 110 - 118
    Cited by:  Papers (26)  |  Patents (7)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (5420 KB)  

    Phonocardiography, the analysis of heart sounds, is a noninvasive diagnostic method useful in studying heart valve function. Phonocardiograms (PCG's) of porcine prosthetic heart valves in the aortic position were analyzed by a parametric signal modeling method in order to derive frequency domain features suitable for the classification of the valve state. View full abstract»

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  • Current Pathways in High-Voltage Injuries

    Publication Year: 1983 , Page(s): 118 - 124
    Cited by:  Papers (10)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (5026 KB)  

    Studies were done in the hog with limb-to-limb contacts at potentials up to 2000 V. The current density in nerve, vessels, muscle, bone, fat, lungs, heart, kidney, liver, intestines, and spinal cord were determined. The current densities in the leg are largest in nerve and artery, followed by muscle, fat, and bone. The temperature was greatest in fat and nerve. With forelimb-to-hindlimb current application, the current densities were largest in the back region. The spinal cord current density was approximately twice the average cross-sectional value. View full abstract»

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  • The Solid Angle of a Plane Triangle

    Publication Year: 1983 , Page(s): 125 - 126
    Cited by:  Papers (64)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (405 KB)  

    An analytical expression is presented for the solid angle subtended by a plane triangle at some arbitrary point in space. Using this expression, the time required for numerical computation is cut down to one third. View full abstract»

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  • A Simple Computerized Neuroanatomical Data Collection System

    Publication Year: 1983 , Page(s): 126 - 130
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2221 KB)  

    A semiautomated data collection system, flexible enough to apply to any microscopic tissue where the data can be accepted as point positions, is described. The design is simple and can be easily implemented on a mini-or microcomputer with minimal additional hardware. The results of a typical neuroanatomical experiment are shown together with an error and time constraint analysis. View full abstract»

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  • Equivalent Electrical Representation of the Sweat Layer and Gain Compensation of the EMG Amplifier

    Publication Year: 1983 , Page(s): 130 - 132
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (573 KB)  

    The sweat layer, formed on the surface of the skin, causes a partial short-circuit of the surface electrodes in an electromyographic (EMG) channel. As a result, the effective input impedance of the channel varies at random and, along with the impedance, the output voltage varies. In this note, the sweat layer has been represented as a variable resistance connected across the input stage of the EMG channel and the effect is analyzed. It has also been shown that the sweat layer's equivalent resistance can also be used for the continuous and automatic gain compensation of the EMG amplifier. View full abstract»

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  • An Ultrafiltration Monitor for Hemodialysis Research

    Publication Year: 1983 , Page(s): 132 - 136
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1046 KB)  

    The ultrafitration rate of hemodialysis membranes should be carefully controlled for maximum patient benefit. A special purpose instrument is described that takes in analog pressure information and the analog output of an appropriate weighing system and produces both digital displays and analog outputs (for a strip-chart recorder) of ultrafiltration rate and ultrafiltration index as well as the averaged mean transmembrane hydrostatic pressure drop and volume of ultrafiltrate. The instrument normally uses an averaging time of about 2 min. View full abstract»

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  • Coronary Artery Disease - Correlates Between Diastolic Auditory Characteristics and Coronary Artery Stenoses

    Publication Year: 1983 , Page(s): 136 - 139
    Cited by:  Papers (46)  |  Patents (11)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (837 KB)  

    A noninvasive approach to detecting coronary artery disease analyzes thoracic sounds to isolate acoustical correlates of stenosed coronary arteries. The analysis includes time windowing, frequency (power spectra) windowing, and averaging of thoracic sounds from normal and diseased patients. Initial results indicate that an above normal percentage of high-frequency (180-300 Hz) energy is closely associated with narrowed coronary arteries. View full abstract»

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  • The Action Potential Clamp as a Test of Space-Clamp Effectiveness - The Lettvin Analog Axon

    Publication Year: 1983 , Page(s): 139 - 140
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1677 KB)  

    For a Lettvin analog axon, in which spurious currents due to inadequate space clamp are absent, the action potential clamp technique accurately reproduces the original stimulating current. The action potential generated for the first phase of the experiment is stored digitally. When this action potential waveform is used for the voltage clamp phase of the experiment, digital noise in the resultant current record is a factor of ten smaller than that of the reproduced current record. The requirement of rapid transition between the two experimental components for such experiments with squid giant axon is examined. View full abstract»

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  • Applications Invited for Transactions Associate Editors for Physiological Modeling and Signal Processing

    Publication Year: 1983 , Page(s): 140
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    Freely Available from IEEE
  • IEEE Transactions on Biomedical Engineering Statement of Editorial Policy

    Publication Year: 1983 , Page(s): 140-a
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    Freely Available from IEEE
  • Institutional listings

    Publication Year: 1983 , Page(s): 140b
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Aims & Scope

IEEE Transactions on Biomedical Engineering contains basic and applied papers dealing with biomedical engineering. Papers range from engineering development in methods and techniques with biomedical applications to experimental and clinical investigations with engineering contributions.

Full Aims & Scope

Meet Our Editors

Editor-in-Chief
Bin He
Department of Biomedical Engineering