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Biomedical Engineering, IEEE Transactions on

Issue 2 • Date March 1978

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Displaying Results 1 - 21 of 21
  • IEEE Transactions on Biomedical Engineering - Table of contents

    Publication Year: 1978 , Page(s): c1
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  • IEEE Engineering in Medicine and Biology Society

    Publication Year: 1978 , Page(s): c2
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  • Source Coding of X-Ray Pictures

    Publication Year: 1978 , Page(s): 121 - 138
    Cited by:  Papers (14)  |  Patents (3)
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    The feasibility of three specific coding schemes for compact storage or fast transmission of radiographic images is investigated. These schemes are: the synthetic high system, the block-coding system, and the run-length coding system. The last two techniques are used for encoding bit planes. The dependence of the compression ratio on image resolution and the feasibility of adaptive coding of bit planes are also examined. View full abstract»

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  • Parameter Estimation of Biological Stochastic Compartmental Models-An Application

    Publication Year: 1978 , Page(s): 139 - 146
    Cited by:  Papers (4)
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    In this paper linear time invariant biological compartmental models are considered, in which the transfer rate constants are assumed to be stochastic variables. View full abstract»

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  • A Computer Simulation Study for the Digital Processing of Longitudinal Tomograms Obtained with a Zone Plate Camera

    Publication Year: 1978 , Page(s): 146 - 154
    Cited by:  Papers (3)
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    Longitudinal tomoplanes characterizing a three-dimensional object distribution suffer from the problem of interference between planes and their information content can be misleading for diagnostic purposes. Techniques for unscrambling linked tomograms are examined and it is demonstrated that matrix inversion generates artifact free tomographic information. This method is perfectly general and has been applied to zone plate coded aperture imaging. For this system the quantum noise limitation has been examined and is relatively independent of the spatial frequency content of the object. Provided sufficient information can be collected, processed reconstructions faithfully represent both high frequency and uniform object distributions. View full abstract»

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  • Scattering and Absorption Efficiencies for Nonspherical Dielectric Objects-Biological Models

    Publication Year: 1978 , Page(s): 155 - 159
    Cited by:  Papers (6)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (943 KB)  

    The Extended Boundary Condition Method (EBCM) is used to calculate electromagnetic scattering and absorption efficiencies (cross sections normalized to the geometric shadow area) for nonspherical objects composed of dissipative dielectric material. The technique is applicable to homogeneous and isotropic objects with electrical size weli into the resonance region. The Forward Amplitude Theorem is used to determine the absorption efficiency from the scattered field. The capabilities of the method are demonstrated by making numerical calculations for a lossy prolate spheroid representing a 0.32 kg rat, a commonly used laboratory animal in microwave biological effects research. Numerical results show the dependence of the efficiencies on the electrical size of the model and the angle of incidence of the arriving wave. Polar plots of the differential cross section give the spatial distribution of the scattered radiation. The specific results generated here should be useful in the design of microwave biological effects experiments and in the interpretation of laboratory results. View full abstract»

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  • A Nonlinear Filtering Technique for the Identification of Biological Signals

    Publication Year: 1978 , Page(s): 159 - 165
    Cited by:  Papers (1)
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    A new nonlinear filtering technique is presented allowing extraction of relevant biological signals from background. The technique s derived from the one of dc restoration used in nuclear electronics. A discussion is given of the problem and a solution through the use of a nonlinear filter is proposed; the filter's way of operating is then described together with a complete multiunit neural spike processing instrument using this filtering technique. Some experimental results are presented. View full abstract»

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  • Evaluation of Congenital Heart Defects from Dynamic Tracer Measurements

    Publication Year: 1978 , Page(s): 166 - 177
    Cited by:  Papers (1)
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    A novel method for the evaluation of the pulmonary to systemic flow rate ratio in patients with congenital heart defects (shunts) is presented. The evaluation is obtained from the analysis of tracer concentration curves recorded during conventional diagnostic tests. The method is based on a deterministic, time-invariant, linear model of the circulatory system. The impulse response curve of n equal-sized perfect mixers in series is used to derive the first passage time distributions that fit the primary portions of the studied tracer curves. This leads to both "open-loop" (excluding recirculation of tracer) and to "closed-loop" shunt evaluations. The former is based on curve-area calculations and the latter on a simple system of two or three algebraic dynamic tracer material balance equations. The method is demonstrated for three actual cases of unidirectional shunts: one right-to-left and two left-to-right. Good agreement of the fitted model to the recorded measurements is obtained. One of the above cases could be cross evaluated by the direct Fick method as well, resulting in practically the same value. View full abstract»

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  • Characterization of the Arterial System in the Time Domain

    Publication Year: 1978 , Page(s): 177 - 184
    Cited by:  Papers (22)
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    The impulse response function and the input impedance of the systemic arterial tree emphasize different aspects of this system. The impulse response function is calculated via inverse Fourier transformation of the input impedance. The effects of truncation of the impedance are reduced by subjecting the data to a Dolph-Chebyshev filter. The impulse response functions of a windkessel model, a uniform tube model, and of the arterial system of the dog, are given. The impulse response functions of the windkessel model and of the arterial system of the control dog show a sharp initial peak followed by an exponential decay (equal decay time as that of the diastolic pressure tracing). The height of the decay extrapolated to time zero is related to total arterial compliance. Total arterial compliance calculated in this way agrees with the value calculated from the ratio of the time constant of the diastolic pressure decay and peripheral resistance. The presence of peaks in the impulse response function indicates a distinct reflection site as shown in the uniform tube model and found in the dog with balloon occlusion of the descending aorta. The measurement of the time intervals between these peaks and the start of excitation together with the pulse wave velocity enable us to calculate the distance between the location of the reflecting site and the heart. View full abstract»

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  • Integrated Micro Multi Ion Sensor Using Field Effect of Semiconductor

    Publication Year: 1978 , Page(s): 184 - 192
    Cited by:  Papers (62)  |  Patents (5)
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    The fabrication of a microprobe for simultaneous, independent and in-vivo measurements of H+ and Na+ ion activities is described. View full abstract»

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  • Practical Considerations in the Implementation of the French-Holden Algorithm for Sampling of Neuronal Spike Trains

    Publication Year: 1978 , Page(s): 192 - 195
    Cited by:  Papers (7)
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    The French-Holden algorithm (1), (2), (3) provides a sampled data time series representation of a neuronal spike train in order to facilitate subsequent analyses by conventional signal processing techniques. Two characteristics of this filtering algorithm make the choice of data record length particularly important: (a) an ideal, sharp cutoff filter is used on the spike train, and (b) the Nyquist sampling frequency is chosen exactly equal to the filter cutoff frequency. In this note, sources of distortion and aliasing errors due to finite data records are discussed and guidelines for the selection of minimum record length are given. View full abstract»

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  • An Experimental Study of a Sensor-Controlled External Knee Locking System

    Publication Year: 1978 , Page(s): 195 - 199
    Cited by:  Papers (5)  |  Patents (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1727 KB)  

    This paper is concerned with the use of microprocessors for control of knee joint locking and unlocking in a prosthesis or orthosis. Inputs to the controller are provided by the wearer and by artificial proprioceptive and exteroceptive sensors. The functioning of an experimental orthotic system is explained and preliminary test results obtained with normal subjects are presented. View full abstract»

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  • A Controlled Filter for Bio-Electric Potentials

    Publication Year: 1978 , Page(s): 199 - 201
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    A controlled filter is proposed for smoothing the slowly changing portion of certain bio-electric potentials without distorting the preceding faster waveform. Considerable noise reduction can be achieved, making more precise definition of epoch and waveform possible. View full abstract»

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  • An Action Potential Clamp to Probe the Effectiveness of Space Clamp in Axons

    Publication Year: 1978 , Page(s): 201 - 204
    Cited by:  Papers (6)  |  Patents (1)
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    The stimulated action potential of a squid giant axon is stored and used as a time dependent input potential during a voltage clamp experiment with this axon. For an optimum system, longitudinal currents are eliminated by guard electrodes and the action potential clamp provides a quantitative measure of this "space clamp." View full abstract»

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  • Error Analysis for Vector Scope Measurement of Pulmonary Mechanics

    Publication Year: 1978 , Page(s): 204 - 205
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    The errors that are incurred by misreading the angle on the oscilloscope face in the determination of pulmonary compliance, resistance, and functional residual capacity with a vector scope are presented. Results indicate that the calculated value will be within 10% of the correct value, provided that the oscilloscope angle is between 10.5 and 78.5 degrees, and the reading error is less than 1 degree. View full abstract»

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  • Microwave Enzyme Inactivation System: Electronic Control to Reduce Dose Variability

    Publication Year: 1978 , Page(s): 205 - 208
    Cited by:  Papers (9)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (813 KB)  

    The use of microwave energy to inactivate enzymes by rapid heating permits measurement of heat stable metabolites with minimal postmortem artifact. Reproducible results, however, require that the energy applied (dose) and the exposure geometry be reproducible. The commercial systems that we have examined are limited in this regard. A method to achieve a reproducible dose by electronic control of the applied power and exposure time is described. The electronics are compatible with any 220 V, signal phase commercial microwave power source. Without electronic control, exposure time varies by 50 ms, due to random contacter closure time. Output power varies by 15%, due to tube aging and variations in line voltage, magnetron temperature, and load impedance during exposure. With the addition of electronic circuitry, the exposure time can be controlled within 3 ms, and the power within 2%. Timing is done by counting energy bursts from the triac controlled magnetron. Leveling is accomplished using a feedback loop to vary the magnetron magnet current to keep the output power constant. The use of these electronic controls makes microwave irradiation systems more reliable as a biochemical research tool. View full abstract»

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  • An Abdominal CCD Camera for the Continuous Video Recording of Sheep Ovary Images During the Reproductive Cycle

    Publication Year: 1978 , Page(s): 208 - 210
    Cited by:  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1652 KB)  

    An intra-abdominal ovary-isolating observation system based on a charge-coupled device (CCD) camera and intended for continuously recording video images of the ovary during the reproductive cycle was constructed and surgically implanted in ewes. A time-related label was generated automatically for the identification of each frame. Results demonstrate the importance and unique capabilities of bio-implantable cameras for long-term studies. View full abstract»

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  • Now... IEEE Conference Publications Catalog

    Publication Year: 1978 , Page(s): 210-a
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    Freely Available from IEEE
  • IEEE Conference Publications of Interest in Stock

    Publication Year: 1978 , Page(s): 210-b
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    Freely Available from IEEE
  • IEEE Transactions on Biomedical Engineering Statement of Editorial Policy

    Publication Year: 1978 , Page(s): 210-c
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  • Institutional listings

    Publication Year: 1978 , Page(s): 210d
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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