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Proceedings of the Fifteenth Annual Northeast Bioengineering Conference

27-28 March 1989

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Displaying Results 1 - 25 of 117
  • Proceedings of the Fifteenth Annual Northeast Bioengineering Conference (Cat. No.89-CH2689-8)

    Publication Year: 1989
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    Freely Available from IEEE
  • Finite element model for the cardiac pump

    Publication Year: 1989
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (51 KB)

    Summary form only given. To predict stress values within the myocardium and to explain the pumping action of the left ventricle, an axisymmetrical model has been formulated. The myocardium is a nonhomogeneous continuum made of an elastic matrix, plus a set of crisscrossed unidimensional helical fibers disposed in such a way that torsional motion is prevented. The fiber is characterized by its loca... View full abstract»

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  • Influence of background ions on the audio streaming potentials produced by human hairs

    Publication Year: 1989
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (86 KB)

    Summary form only given. Human hair, unaltered by dyes or permanents, was collected to study the influence of various cations on the streaming potentials produced by pressure waves in the audio frequency range. The movement of potassium and sodium cations at the hair interface produced potentials which were markedly different for the two cations. It appears that the increased permeability and bind... View full abstract»

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  • Noise reduction for hearing aids

    Publication Year: 1989
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (81 KB)

    Summary form only given. An overview is given of the various forms of signal processing for noise reduction that have been developed for hearing aid applications. One- and two-microphone systems are discussed. A more advanced form of a two-microphone system is also examined.<> View full abstract»

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  • Behavioral evaluation of noise suppression hearing aids

    Publication Year: 1989
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (43 KB)

    Summary form only given. Hearing-aid manufacturers have introduced so-called smart noise-suppression systems that intelligently adapt in the presence of background noise, thereby improving the hearing-aid user's ability to hear under adverse listening conditions. How well hearing-aid users perform on speech recognition measures with commercially available noise suppression systems is addressed.< View full abstract»

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  • Evaluation of the efficiency of a newly developed permanent implantable mechanical cardiac assist device

    Publication Year: 1989
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (82 KB)

    Summary form only given. A permanent implantable mechanical cardiac assist device has been developed to operate efficiently and to be easily implanted. The assist, a counterpulsation device, increases aortic pressure during diastole and reduces aortic pressure just prior to systole displacing a volume of blood. The efficiency and power required by the assist are important factors in evaluating the... View full abstract»

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  • Application of root locus technique to the model for pacemaker control of venous oxygen saturation level

    Publication Year: 1989, Page(s):73 - 74
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (96 KB)

    Summary form only given. A pacemaker-cardiovascular system sets a reference venous oxygen saturation level as the input and cardiovascular venous oxygen saturation as the output. The error drives the pacemaker with gain to regulate the heart rate. Cardiac output is obtained as a function of heart rate and the work load (using the Frank-Starling mechanism). The oxygen supplied by the blood is consu... View full abstract»

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  • Assessment of carotid stenosis as a source of reflected pressure waves using a transmission line model

    Publication Year: 1989
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (37 KB)

    Summary form only given, as follows. A transmission-line model is developed to assess the effects of carotid stenosis on the arterial pressure wave. In particular, the stenosis as a source of reflection is examined. The arterial system from the heart to the carotid bifurcation is modeled with a graded stenosis, representing a progressive atherosclerotic lesion simulated at the bifurcation. Within ... View full abstract»

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  • Motion analysis of upper extremity using six degree of freedom sensors

    Publication Year: 1989
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (72 KB)

    Summary form only given. The accurate monitoring of extremity motion in the past has been a difficult and tedious task. A process has been developed using a McDonnel Douglas 3Space Digitizer and a Macintosh microcomputer which quickly and accurately provides motion data for a task involving general motion in three dimensions. The digitizer uses electromagnetic technology to create a field around a... View full abstract»

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  • Visual-vestibular interaction during rotation about the Earth horizontal axis

    Publication Year: 1989
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (63 KB)

    Summary form only given. Seven human subjects were tested for visual-vestibular interaction (VVI) in a constant-velocity Earth horizontal axis (EHA) yaw rotation. This so-called barbecue-spit rotation provides an angular acceleration pulse to the horizontal semicircular canals and a constantly rotating gravity vector to the otolith organs. The subjects were tested with their eyes open in the dark ... View full abstract»

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  • Viscoelastic measurements in soft tissue

    Publication Year: 1989
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (61 KB)

    Summary form only given. A study was made of viscoelastic changes in the limb in the presence of the compartment syndrome, which can occur when muscle tissues swell following trauma. Measurements were made of the applied pressure-volume displacement curves with a 1.4-cm/sup 2/ indenter placed on the limb surface above the compartment. The noninvasively measured viscoelastic departure from purely e... View full abstract»

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  • Using signal processing techniques for DNA sequence comparison

    Publication Year: 1989, Page(s):173 - 174
    Cited by:  Papers (11)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (176 KB)

    The most widely used algorithm for the comparison of two sequences of DNA are O(m×n) on the lengths, m and n, of the sequences been compared. The authors present a comparison algorithm that is O(nlog n) on the length, n, of the longer sequence. This algorithm uses techniques developed for rapid comparison of two discrete signals,... View full abstract»

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  • Breathing modulates fetal heart rate

    Publication Year: 1989, Page(s):233 - 234
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (120 KB)

    To assess the modulation of fetal heart rate (FHR) by breathing movements, the authors investigated the relationship between FHR and fetal breathing rate (FBR). FHR was obtained from the R-R interval of the EKG and FBR from the burst-burst interval of the diaphragmatic electromyogram (EMG). The R-R intervals of EKG and burst-burst interval of the diaphragmatic EMG were determined using a template ... View full abstract»

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  • Semi-invasive fiber-optic tonometer

    Publication Year: 1989, Page(s):167 - 168
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (176 KB)

    A semi-invasive method for the instantaneous and continuous measurement of absolute blood pressure in small arteries is developed using the principle of arterial tonometry. This is accomplished with a miniature implantable fiber-optic sensor enclosed in an applanation ring and positioned around the artery. A reflective stainless-steel diagram (0.005 mm) bonded to a stainless-steel block is used to... View full abstract»

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  • Effects of rapid onset acceleration on cephalic pulsatile blood volume impedance waveforms in humans

    Publication Year: 1989, Page(s):129 - 130
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (152 KB)

    Electrical impedance plethysmographic measurements of the relative changes in cephalic pulsatile blood volume (rheoencephalography, or REG) have been performed clinically for many years. REG indices provide information about cerebral vascular resistance (CVR). The technique has been used to noninvasively monitor real-time cephalic pulsatile blood volume changes in humans exposed to acceleration st... View full abstract»

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  • Spectral analysis of heart rate variability using diaphragmatic EMG burst activity as a time base

    Publication Year: 1989, Page(s):231 - 232
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (136 KB)

    Spectral analysis of heart-rate variability (HRV) normally reveals a harmonic mode associated with breathing activity. Since this mode is locked to the breathing rate, temporal variations in breathing rate lead to a broadening of the HRV spectral peak width. It is shown that specific knowledge of breathing activity can be used to eliminate this broadening View full abstract»

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  • Swallowable or implantable body temperature telemeter-body temperature radio pill

    Publication Year: 1989, Page(s):165 - 166
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (124 KB)

    The author introduces a body-temperature-transmitter-body-temperature-radio pill which can be swallowed or implanted. It shows the internal temperature under natural conditions with an accuracy of ±0.1°C. The dimensions are 6.5 mm diameter and 26-28 mm length. Using a 5.5 mm diameter×3.0 mm thick lithium battery, the pill can operated continuously for one month View full abstract»

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  • Measurements of vascular wall O2 consumption following increased potassium

    Publication Year: 1989, Page(s):245 - 246
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (176 KB)

    Vascular wall tissue PO2 was measured with recessed cathode microelectrodes (tip diameters <5 μm) in either strips or perfused segments of rabbit abdominal aortas (n=10). When bathed by saline with low K+ (4 mEq/L) oxygenated at 20 kPa, the minimum wall PO2 was 6.65±1.56 (S.E.) kPa for seven aortic strips and 10.38±0.54 kPa for 16 measu... View full abstract»

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  • Comparison of Hartley and Cas-Cas transforms in medical image compression

    Publication Year: 1989, Page(s):127 - 128
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (348 KB)

    The Hartley and Cas-Cas transforms which are discrete and real-to-real, are compared in terms of times taken, compression ratios and quality of the reconstructed image, for the purpose of comparing their suitability for transform domain compression applications. A thresholding method for quantization is introduced where threshold values are adaptively selected according to the correlation factor o... View full abstract»

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  • Further results utilizing the MRE principle in inverse electrocardiography

    Publication Year: 1989, Page(s):229 - 230
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (164 KB)

    The authors explore two linearized implementations of the application of a frequency-domain method, the minimum relative entropy (MRE) reconstruction principle, to the inverse problem in electrocardiography. These methods reconstruct the power spectrum of each epicardial signal, in contrast to most methods that have been applied to this problem, which operate in the time domain of the data using r... View full abstract»

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  • Using optimally focused electromagnetic power for hyperthermia treatment of deep tumors in biological tissue

    Publication Year: 1989, Page(s):163 - 164
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (148 KB)

    Favorable responses to heating tumors to 42-45°C has lead to development of electromagnetic antenna applicators which noninvasively couple power to cancerous tumors. This modality avoids surgery trauma, healthy tissue destruction from ionizing radiation, and toxic effects of chemotherapy. By adjusting the antenna radiation characteristics, it is possible to focus power on abnormal tissue while... View full abstract»

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  • Intraocular lens optical quality testing

    Publication Year: 1989, Page(s):47 - 48
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (88 KB)

    The possibility that problems relating to the optical quality of manufactured intraocular lenses (IOLs) may require regulatory attention is addressed. Based on the American National Standard for Ophthalmics-Intraocular Lenses-Optical and Physical Requirements (ANSI Standard Z80.7-1984), the US Food and Drug Administration (FDA) will soon be ready for conformance testing of IOLs. A description is g... View full abstract»

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  • Imaging multi-spectral fluorescent probes in living cells at video rates

    Publication Year: 1989, Page(s):243 - 244
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (180 KB)

    A fast digital imaging fluorescence microscope capable of obtaining multispectral images at video rates (30/s) has been developed. It integrates commercially available equipment with custom-made circuitry and software to record freeze-frame images of 100-ms duration every 1/30 s. The components involved and the sources of noise have been fully characterized to use their models in offline processin... View full abstract»

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  • A magnetic resonance image processing system for cardiac research

    Publication Year: 1989, Page(s):125 - 126
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (184 KB)

    Analysis of magnetic resonance images (MRI) is often limited to hardware and software provided by the manufacturer. To circumvent this problem the authors developed a Unix-based system using a Sun S3/60 workstation. They acquire multiple series of ECG (electrocardiogram) gated images. Typically in a single acquisition there are four oblique long-axis slices centered around the left ventricle (LV) ... View full abstract»

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  • A QRS detection algorithm for discriminating artifacts in ECG records

    Publication Year: 1989, Page(s):227 - 228
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (140 KB)

    A simple and efficient algorithm has been developed to detect QRS complexes at high speed (approximately 32 times real-time speed) from the single-channel digitized ECG (electrocardiogram) data records. This algorithm discriminate QRS complexes against various artifacts, including those due to tape-recorder amplifier saturation. Attenuation of noise (60-Hz power-line frequency) is obtained in a sy... View full abstract»

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