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Biomedical Engineering, IEEE Transactions on

Issue 7 • Date July 1983

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

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

    Publication Year: 1983 , Page(s): c2
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  • The Detection of Auditory Evoked Responses Using a Matched Filter

    Publication Year: 1983 , Page(s): 369 - 376
    Cited by:  Papers (12)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2321 KB)  

    A method has been developed to detect auditory brainstem evoked responses (ABR's) using a minimum amount of computer averaging. The method employs a matched filter to detect the ABR buried in the EEG. The matched filter system can also be used to predict wave V latency, which is useful in testing for hearing loss. By using a matched filter derived from an ABR obtained at a high-stimulus level, it is possible to calculate wave V latency at lower intensity levels much faster. Excellent correlation is seen between wave V latencies calculated in this manner, and those obtained after significant amounts of averaging. Because of this, the matched filter system can reduce the amount of time required for a hearing loss test from 20¿30 min to approximately 5¿10 min with no significant degradation in results. View full abstract»

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  • A Computer Simulation Study of Diffraction Tomography

    Publication Year: 1983 , Page(s): 377 - 386
    Cited by:  Papers (67)  |  Patents (1)
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    The filtered backprojection algorithm of X-ray tomography and the filtered backpropagation algorithm developed recently by the author for diffraction tomography are tested in computer simulations of ultrasonic tomography of two-dimensional objects for which the Rytov approximation is valid. It is found that the filtered backprojection algorithm gives unsatisfactory results even for wavelengths much smaller than the smallest scale over which the object varies. The filtered back-propogation algorithm yields, in all cases studied, high-quality reconstructions which are simply low-pass filtered versions of the actual object profile. It is shown that the filtered backpropagation algorithm can be approximated by a modified backprojection algorithm having essentially the same computation requirements as filtered backprojection, but yielding considerably higher quality object reconstructions. View full abstract»

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  • Spectral Analysis of Electrical Impedance Measurements on the Lower Limbs

    Publication Year: 1983 , Page(s): 387 - 392
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (3850 KB)  

    Electrical impedance signals from the lower limbs of normal individuals and patients with atherosclerosis have been studied in the frequency domain. A current of 1 mA at 40 kHz was introduced with strip electrodes around the ankles, and voltage differences were measured with electrodes above the knee and above the current electrode of the same limb. The impedance signal AZ and the ECG were recorded on magnetic tape and transferred to a digital computer. The first derivative of the impedance signal, dZ/dt, was calculated by numerical methods from the coherent average of at least 20 AZ signals, and the spectra were obtained by an FFT algorithm. For young normal individuals, only 1 percent of the dZ/dt signal energy lies above 12 Hz. Patients with arterial obstructions present a greater attenuation in the lower harmonics, stretching the 99 percent energy bandwidth to 32 Hz. Although the amplitude of some spectral components can be used for noninvasive evaluation of arterial disease with a precision of up to 90 percent, it was found that the phase spectra are very little influenced by atherosclerosis. View full abstract»

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  • ECG Enhancement by Adaptive Cancellation of Electrosurgical Interference

    Publication Year: 1983 , Page(s): 392 - 398
    Cited by:  Papers (17)  |  Patents (23)
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    A technique utilizing a combination of adaptive noise canceling and conventional signal processing is developed to enhance electrocardiographic monitoring in the operating room by reducing the noise interference that is created by an electrosurgical instrument. Significant amounts of interference are eliminated by radio frequency shielding, passive and active low-pass filtering, and optical isolation. A digital adaptive canceler using the least mean-square algorithm of Widrow and Hoff is used to reduce the remainder of the interference, yielding an improvement in signal-to-noise ratio of approximately 110 dB. Clear electrocardiograms have been obtained with electrocautery equipment in operation. View full abstract»

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  • A Unified Approach to Represent Metal Electrode Polarization

    Publication Year: 1983 , Page(s): 399 - 406
    Cited by:  Papers (16)
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    A unifying approach based on methods of linear and nonlinear systems engineering theory to conveniently analyze the metal electrode polarization is presented. The polarization phenomenon is modeled in the linear and nonlinear range. The linear model is based on an exentension of Bode's method consisting of a number of time constant distributions of the Davidson¿Cole type. In the nonlinear range, the describing function method is used to analyze the interface in terms of a modified saturation element in cascade with a linear part. The linear part of the nonlinear model has the same form as the linear model with shorter "apparent" average time constants than the corresponding linear representation. The applicability of the method is illustrated using the platinum electrode data. However, the methodology is equally appropriate to the study of a wide class of interfacial and dielectric polarization phenomena characterized by a special dispersion behavior. View full abstract»

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  • The Effect of Stimulus Parameters on the Recruitment Characteristics of Direct Nerve Stimulation

    Publication Year: 1983 , Page(s): 407 - 414
    Cited by:  Papers (87)  |  Patents (10)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2704 KB)  

    The effect of stimulus parameters on the recruitment characteristics of motor nerve was studied for regulated current monophasic and balanced charge biphasic stimuli. Results of a nerve model investigation indicated that the threshold difference between different diameter nerve fibers would be dependent on pulse width, the choice between monophasic and biphasic stimuli, and the delay between the primary cathodic and secondary anodic pulses. Threshold difference increased with decreasing pulse width, the greatest effects evident for pulses less than 100 ¿s. Biphasic stimulation with no delay between pulses provided greater threshold separation than monophasic stimulation or biphasic stimulation with delay. Animal experiments, in which recruitment in a nerve trunk composed of mixed diameter nerve fibers was examined, showed a decrease in recruitment slope with a decrease in pulse width and with the use of a biphasic, zero delay pulse. These results were examined through muscle force measurements using both a metal loop electrode encircling the nerve trunk and a nerve cuff electrode, i. e., a loop electrode in an insulating tube. View full abstract»

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  • Transthoracic Ventricular Defibrillation in the 100 kg Calf with Symmetrical One-Cycle Bidirectional Rectangular Wave Stimuli

    Publication Year: 1983 , Page(s): 415 - 422
    Cited by:  Papers (21)  |  Patents (24)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2799 KB)  

    From 2760 fibrillation-defibrillation episodes in 100 kg calves, the effectiveness of reversing ventricular fibrillation of 30 s duration with symmetrical one-cycle bidirectional rectangular-wave shocks was determined. Pulse widths of 0.5-64 ms, pulse amplitudes of 35,50,70,100, and 140 A, and delivered pulse energies in the 93-1567 J range were employed in a primary study involving 39 animals. Families of curves relating percent successful defibrillation and the time intervals required for the return ofventricular activity and of normal sinus rhythm in the postdefibrillation electrocardiograms to the parameters of the delivered shocks were derived. In an eight-calf supplementary study involving 91-110 kg animals, the effectiveness of 50 A, 10 ms bidirectional rectangular wave shocks and 70 A, 6 ms unidirectional rectangular wave shocks were stringently compared by interlacing fibrillation-defibrillation episodes involving 120 bidirectional and 120 unidirectional shocks. When combined with previously published data for unidirectional wave shocks in 100 kg calves, our data suggest that pulse amplitude and pulse width specifications are considerably broader for successful bidirectional rectangular wave shocks than for unidirectional rectangular wave shocks, and that appreciably higher first-shock successful defibrillation (96-99 percent) can be achieved with bidirectional waveforms View full abstract»

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  • A Modified Reconstruction Filter for Diverging X-Ray Beams

    Publication Year: 1983 , Page(s): 423 - 426
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (686 KB)  

    The 3-D reconstruction of a density function for diverging X-ray beams, based on the direct convolution algorithm, was developed by Lakshminarayanan. In this method, the reconstruction of a section of an object was obtained as the average, over all source positions, of the backprojected data convolved with an appropriate filter function. In this note, a modification of Lakshminarayanan's filter is proposed. The modified filter has less undesirable high-frequency components, yet it retains the convolution property. It is shown that the new filter has less oscillatory response across the edge of highly absorbent structures (e. g., bones). Finally, it is shown how the modified fan-beam filter can be FFT implemented. View full abstract»

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  • Applications Invited for Transactions Associate Editor for Physiological Modeling

    Publication Year: 1983 , Page(s): 426
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  • Set your sails for Columbus and the 5th Annual IEEE-EMBS Conference

    Publication Year: 1983 , Page(s): 426a
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  • Now is the best time to join our Society

    Publication Year: 1983 , Page(s): 426-b
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  • IEEE Transactions on Biomedical Engineering Statement of Editorial Policy

    Publication Year: 1983 , Page(s): 426-c
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  • Institutional listings

    Publication Year: 1983 , Page(s): 426d
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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