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Biomedical Engineering, IEEE Transactions on

Issue 1 • Date Jan. 1979

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  • IEEE Transactions on Biomedical Engineering - Table of contents

    Publication Year: 1979 , Page(s): c1
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  • IEEE Engineering in Medicine and Biology Society

    Publication Year: 1979 , Page(s): c2
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  • Editorial

    Publication Year: 1979 , Page(s): 1
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  • Editorial

    Publication Year: 1979 , Page(s): 2
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  • The Nature and Etiology of Normal and Alcohol Withdrawal Tremor

    Publication Year: 1979 , Page(s): 3 - 10
    Cited by:  Papers (1)  |  Patents (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1220 KB)  

    Alcohol withdrawal tremor is principally a postural-type tremor. That is, the tremor manifests itself most when the limbs are voluntarily maintained in a stationary position. The tremor of alcohol withdrawal is typically 5 to 20 times as large and approximately the same frequency as normal postural tremor. The fact that withdrawal tremor is uncorrelated in both outstretched hands argues against the involvement of a central pacemaker in the genesis of the tremor. Both withdrawal and normal physiologic type hand tremors are associated with synchronous firing of extensor motor units in phase with tremor velocity at the frequency of limb resonance. Both kinds of tremor are reduced by the p-adrenergic receptor blocking drug, propranolol. The reduction in tremor is caused by a decrease in the synchrony of motor units and not a decrease in the total number of units involved in maintaining limb posture. It is proposed that increased tremor during withdrawal is due to the entrainment by 1 A muscle spindle afferents of asynchronously firing motoneurons. Tremor is also increased by entrainment of motoneurons firing synchronously at 9 to 10 Hz due to an oscillation in the stretch reflex control system. Tremor reduction following propranolol is due to a decrease in entrainment because of decreased 1 A afferent inflow to the spinal cord or because of reduced sensitivity of alpha motoneurons to 1 A spindle afferent discharges. View full abstract»

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  • C-Mode Scan and Resolution Improvement Techniques for Ultrasonic Diagnosis

    Publication Year: 1979 , Page(s): 11 - 17
    Cited by:  Papers (1)
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    This paper presents a new method for obtaining plane images perpendicular to the axis of the transducer and discusses some resolution improvement techniques utilizing a computer. The method, called C-mode scan, is carried out by successive application of a conventional B-mode scan, and supplies more information such as the outline, size, and extent of a lesion such as a breast tumor. To improve the resolution of a transducer, a deconvolution technique together with non-linear filtering are employed from a spectral point of view. Several clinical images produced by C-mode and the computer improvement of resolution are demonstrated. View full abstract»

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  • An Improved Correction of Distorted Indicator-Dilution Curves

    Publication Year: 1979 , Page(s): 18 - 21
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    Venoarterial indicator dilution curves are distorted by non-ideal injection and by the monitoring system. An improved method of correcting these curves is developed assuming that a linear model of perfect mixers in series can be fitted to the physiologic system response as well as to the subsystem responses. View full abstract»

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  • Integral Characteristics of the Human Cardiac Electrical Generator from Electric Field Measurements by Means of an Automatic Cylindrical Coordinator

    Publication Year: 1979 , Page(s): 21 - 28
    Cited by:  Papers (4)  |  Patents (3)
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    An automated electronic system based upon a cylindrical coordinator was constructed for measurement and preliminary computational processing of the heart electrical potentials on the surface of a human torso and of the coordinates of this surface. The potential distribution on the body surface at consecutive instants of time and the geometrical parameters of the body received as the output of the measuring system can be used for investigation of various types of mathematical descriptions, or models of the cardiac electrical generator. One such mathematical description, a set of integral characteristics of the cardiac electrical generator, is studied in this work. These characteristics are: three components of the heart dipole moment, three coordinates of the moving cardiac electrical center and the complexity parameter of the cardiac generator. The results of experimental measurement of the cardiac electrical field and calculation of the integral characteristics of the cardiac generator are presented for a group of healthy men. Physical and electrophysiological significance of the results is briefly discussed. View full abstract»

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  • Potential Temperature Rise Induced by Electromagnetic Field in Brain Tissues

    Publication Year: 1979 , Page(s): 29 - 34
    Cited by:  Papers (36)
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    The differential temperature rise in a spherical region stimulating a potential hot spot in the central region of a human head has been determined, takdng into account heat conduction as well as heat convection due to blood flow. The results apply in general to ali cases where the dimensions of the model and the frequency of the incident electromagnetic wave is such that a hot spot is formed near the central region. For a heat deposition rate of 10 mW/g in a hot spot of 1 cm radius, a differential temperature rise over the ambient tissues and blood is approximately 0.5°C. This corresponds to the case of a differential absorption cross section of 1 cm-1 for a 5 cm radius sphere exposed to an incident power density of 10 mW/cm2. For larger models of man's head the differential temperature rise is smaller. View full abstract»

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  • Computer-Controlled Spectral Measurements of Blood Cells

    Publication Year: 1979 , Page(s): 34 - 43
    Cited by:  Papers (1)  |  Patents (12)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2814 KB)  

    A Zeiss scanning microscope photometer with a monochro-mator was assembled and interfaced with a Digital Equipment Corporation PDP-12 computer to form an automated single-beam microspectrophotometer for making spatial and particularly spectral scans of Romanowsky-stained blood cells. The spectra, covering 400-700 nm, are stored on tape for subsequent data processing. The limitations on the accuracy and precision of the measurements are discussed. Photo-metric precision was limited by ±1% peak-to-peak fluctuations associated with the source and with mechanical instability. However, in strong absorption bands digitization error predominated. These random errors were reduced by time-averaging of multiple sampling points, and by averaging data for several cells. Photometric accuracy was limited by stray light, which produced an apparent transmittance of 0.014 for an 8-¿m-square opaque object. Distributional error was found to be 6.6% in a neutrophil nucleus. Spectra were obtained for 24 cells each for nucleus and cytoplasm of neutrophils, basophils, eosinophils, lymphocytes and monocytes, and for erythrocytes. Six blood specimens were used. The biological variability in absorbance produced ±17% coefficient of variation for cytoplasm and erythrocytes and ±7% for nuclei. The spectra are interpreted on the basis of metachromatic and nonmetachromatic thiazine absorption peaks, the eosin absorption peak, and unresolved eosin-thiazine peaks. View full abstract»

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  • A Comb-Filtered Noise Generator for Use in Auditory Neurophysiological and Psychophysical Experiments

    Publication Year: 1979 , Page(s): 43 - 47
    Cited by:  Papers (6)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2143 KB)  

    A digital CMOS comb-filtered noise generator has been developed for use as a stimulus in auditory physiological and psycho-physical experiments. It incorporates two identical, 34-bit shift register pseudo-random noise generators whose outputs are summed and low-pass filtered. By introducing a delay between the generators, a noise power spectrum results which is co-sinusoidal on a linear frequency scale (i.e., "comb-filtered"). The generator may be operated either manually or automatically with a range of delays of 1 Ps or greater, selectable in 1 ps increments. The polarity of one of the shift registers may be changed to produce an inverted output spectrum. The peak-to-valley ratio of the spectrum is adjustable in discrete steps over the range from 0 to 35 dB. The output noise is low-pass riltered at 50 kHz, and has Gaussian amplitude characteristics to 3 a. View full abstract»

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  • Electrocutaneous Tracking: A Methodology for Evaluating Sensory Feedback Codes

    Publication Year: 1979 , Page(s): 47 - 49
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (667 KB)  

    An objective and relevant methodology for evaluating sensory feedback codes has been developed using electrocutaneous tracking. This methodology involves dynamic (or continuous) interpretation and response by a subject to electrically produced cutaneous sensations. Results from the comparison of ten codes are briefly presented here to show the usefulness of this methodology. A general purpose computer-controlled electrocutaneous stimulation facility being developed is expected to expedite the examination of many other sensory feedback codes. View full abstract»

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  • Signal Detection via Phase-Locked Sampling in a Magnetic Search Coil Eye Movement Monitor

    Publication Year: 1979 , Page(s): 50 - 52
    Cited by:  Papers (5)  |  Patents (1)
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    Two inexpensive techniques are introduced for use in Robinson's (1) magnetic search coil method of measuring eye rotations. Included is a method of detection which yields a dc voltage level proportional to eye position via phase-locked sampling. View full abstract»

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  • Modeling of an Active Nerve Fiber in a Finite Volume Conductor and Its Application to the Calculation of Surface Action Potentials

    Publication Year: 1979 , Page(s): 53 - 56
    Cited by:  Papers (21)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (793 KB)  

    Potentials within and on the surface of a finite cylindrical volume conductor due to a single active nerve fiber along its center have been calculated by solving Laplace's equation using a relaxation model. The results have enabled the variation of the potential that would be recorded from a surface electrode to be estimated for differing nerve depths and conduction velocities. View full abstract»

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  • A Hydraulic Micromanipulator

    Publication Year: 1979 , Page(s): 56 - 58
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    For biological experiments requiring manipulations under a microscope, it is necessary to have remote control for the manipulator. Available systems offer the required accuracy at a high cost. Passive micromanipulators are economical but are deficient in performance, the most serious defects being the inability to attenuate operator-induced vibrations and lack of speed control The manipulator described in this paper provides versatile remote control and may be constructed economically. View full abstract»

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  • A Model for Predicting the Reliability of EEG Power Spectral Density Estimates of Subcortical Spiking Frequency

    Publication Year: 1979 , Page(s): 58 - 59
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    A model for predicting the reliability of power spectral density (PSD) indicators of spike-to-spike intervals taken from EEG time series is proposed. The analysis shows that the PSD is corrupted by irregularities in spike spacing and that conditions are improved if a larger number of spikes are included in the EEG epoch. View full abstract»

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  • IEEE Standard Dictionary of Electrical and Electronics Terms [advertisement]

    Publication Year: 1979 , Page(s): 59-a
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  • IEEE copyright form

    Publication Year: 1979 , Page(s): 59-b - 59-c
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  • IEEE Publications of Interest in Stock

    Publication Year: 1979 , Page(s): 59-d
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  • An invitation to Membership

    Publication Year: 1979
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  • IEEE Transactions on Biomedical Engineering Statement of Editorial Policy

    Publication Year: 1979 , Page(s): 59-f
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  • Institutional listings

    Publication Year: 1979 , Page(s): 59g
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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