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Biomedical Engineering, IEEE Transactions on

Issue 5 • Date May 1987

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Displaying Results 1 - 15 of 15
  • IEEE Transactions on Biomedical Engineering - Table of contents

    Page(s): c1
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  • IEEE Engineering in Medicine and Biology Society

    Page(s): c2
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  • A Left Ventricular Function Analyzer and Its Application

    Page(s): 317 - 328
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    This paper describes the design of an image processor for the total evaluation of cardiac function. The system quantitatively evaluates cardiac function efficiently and accurately. Its functions include automatic boundary extraction, computation of volume, and three-dimensional display of a left ventricle. The method of automatic boundary extraction comprises: 1) processing to vignette and then correct blur using a Hadamard transformation, and 2) processing to extract the boundary automatically and reliably. View full abstract»

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  • A Comparison of One- and Two-Dimensional Classification of Hemagglutination Reactions in Microplates

    Page(s): 329 - 335
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    The ability of a two-dimensional classification system to improve detection of weak hemagglutination reactions was investigated. Two canonical variables were derived by stepwise linear discriminant techniques from a set of 24 measurements of light absorbance for each of 605 hemagglutination reactions. A test set of 3864 reactions were then classified by the k nearest neighbor algorithm using either the first canonical variable or both variables. No improvement in the ability to distinguish positive reactions from negative ones was found when the second canonical variable was added. This implies that all of the information about hemagglutination reactions in microplates is contained in the first canonical variable. Thus, computationally expensive two-dimensional pattern classifiers will not improve the performance of automated microplate hemagglutination detection. It appears that it will be necessary to reduce the size of the light beam used to measure light absorbance in order to improve detection of weak reactions. View full abstract»

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  • A Computer Model of Acoustic Wave Scattering in Soft Tissue

    Page(s): 336 - 344
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    A model describing the scattering and image formation processes involved in conventional pulse-echo ultrasonic imaging is considered. Emphasis is placed on the transient scattering of ultrasound from dispersive soft tissue, since this is the most computationally demanding task of the simulator under development. The spectral approach considered here includes several useful features such as frequency-dependent attenuation, multiple scattering, arbitrary bulk modulus and density distributions, as well as realistic pulse configurations. Some examples illustrating the scattering algorithm are presented. When fully implemented, the simulator may serve as a test bed for ultrasonic tissue characterization, in which system and tissue parameters can be specified a priori, and various characterization methods can be compared and evaluated. View full abstract»

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  • An Analytical Descrptor of Three-Dimensional Geometry: Application to the Analysis of the Left Ventricle Shape and Contraction

    Page(s): 345 - 355
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    A novel method to describe the instantaneous three-dimensional (3-D) geometry of the left ventricular (LV) endocardial surface by an analytical time-varying scalar function of Fourier spectrum coefficients is suggested. The method utilizes experimental echocardiographic data and uses a helical coordinate system to transform the 3-D data into a unidimensional numerical function. The instantaneous numerical function is then represented by its Fourier sine series which serves as an analytical shape descriptor from which the 3-D shape is reconstructed. The procedure can also be applied to data compression (spatial low-pass filtering), spectral analysis, and the evaluation of geometric similarity of 3-D shapes. When applied to the endocardial surface of the LV at end-diastole (ED) and end-systole (ES) this technique gives a quantitative analysis of the global LV contraction of the real heart. View full abstract»

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  • Computer Analysis of Heart Motion from Two-Dimensional Echocardiograms

    Page(s): 356 - 364
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    In two-dimensional echocardiography the study of the motion of the heart, especially of the left ventricle, is of central interest. Although the clinician can see this motion on real-time two-dimensional echocardiograms, its quantification can still be greatly improved. This paper presents and tests a computer method to quantify the motion of the heart from digitized image sequences. This method computes on every point of an image the two-dimensional velocity vector which characterizes its motion from this image to the next. This approach has the following advantages: 1) border recognition algorithms are no longer needed, 2) motion is not restricted to its radial component, and 3) motion information is available on every point of the image. View full abstract»

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  • Estimation of Myoelectrc Conduction Yelocity Distribution

    Page(s): 365 - 374
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    An estimator of muscle fiber conduction velocity probability density function is derived. It is based on the measurement of the cross-and autopower spectra of surface myoelectric signals. Sample experimental results are compared to the results of other methods. View full abstract»

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  • A Whole Body Thenmal Model of Man During Hyperthermia

    Page(s): 375 - 387
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    A whole body thermal model of man has been developed to predict the changes in regional temperatures and blood flows during hyperthermia treatments with the miniannular phased array (MAPA) and annular phased array (APA) applicators. A model of the thermo-regulatory response to regional heating based on the experimental and numerical studies of others has been incorporated into this study. Experimentally obtained energy deposition patterns within a human leg exposed to the MAPA were input into the model and the results were compared to those based upon a theoretical deposition pattern. Exposure of the abdomen to the APA was modeled with and without the aberrant energy deposition that has been described previously. Results of the model reveal that therapeutic heating (42°C) of extremity soft tissue sarcomas is possible without significant systemic heating. Very high bone temperatures (50°C) were obtained when the experimental absorption pattern was used. Calculations show that systemic heating due to APA exposure is reduced via evaporative spray cooling techniques coupled with high-velocity ambient air flow. View full abstract»

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  • Spectral Broadening in Ultrasonic Doppler Flowmeters Due to Unsteady Flow

    Page(s): 388 - 391
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    It is shown that time-varying velocity produces frequency modulation of the backscattered signal in ultrasonic Doppler flowmeters. Further, for blood flow in the ascending aorta, it is estimated that the spectrum of the backscattered signal would have a very wide bandwidth in the acceleration phase. View full abstract»

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  • Circuit for Monitoring the Median Frequency of the Spectrum of the Surface EMG Signal

    Page(s): 391 - 394
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    The power spectrum of the surface EMG signal is known to undergo a compression towards the lower frequencies during sustained muscle contractions. The median frequency appears to be the preferred parameter to monitor this compression. This paper describes a simple circuit which can provide an estimate of the median frequency. View full abstract»

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  • 1988 IEEE International Symposium on Circuits and Systems

    Page(s): 395
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  • First IFAC Symposium on Modeling and Control in Biomedical Systems

    Page(s): 396
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  • IEEE Transactions on Biomedical Engineering Statement of Editorial Policy

    Page(s): 396-a
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  • Institutional listings

    Page(s): 396b
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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