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Biomedical Engineering, IEEE Transactions on

Issue 8 • Date Aug. 1986

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Displaying Results 1 - 22 of 22
  • IEEE Transactions on Biomedical Engineering - Table of contents

    Publication Year: 1986 , Page(s): c1
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    Freely Available from IEEE
  • IEEE Engineering in Medicine and Biology Society

    Publication Year: 1986 , Page(s): c2
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    Freely Available from IEEE
  • Role of Light Scattering in Spectrophotometric Measurements of Arteriovenous Oxygen Difference

    Publication Year: 1986 , Page(s): 729 - 734
    Cited by:  Papers (7)  |  Patents (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1240 KB)  

    The role of light scattering in the spectrophotometric measurement of arteriovenous oxygen difference (a ¿vO2) in whole blood was investigated. Optical absorbance of whole blood and corresponding hemoglobin solutions was measured to elucidate the contributions of true absorbance and "total scattering effects" to the total absorbance of whole blood. Twersky's radiation scattering theory, which provides a mathematical separation of absorbance and total scattering effects, was applied to the data. It is shown that, although the optical density of whole blood is a highly nonlinear function of hematocrit, the difference in optical density between venous and arterial blood is approximately a linear function of the arteriovenous difference in oxygen content. Furthermore, "total scattering effects" contribute significantly more than true absorbance to the total optical density of whole blood and hence to the actual spectrophotometric measurement of a ¿vO2. Twersky's equation fits the data remarkably well and thus provides a theoretical basis for whole blood measurements. The validity of whole blood spectrophotometric arteriovenous oxygen difference analyzers is thus demonstrated both empirically and theoretically. View full abstract»

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  • The Myoelectric Signal of Electrically Stimulated Muscle During Recruitment: An Inherent Feedback Pareter for a Closed-Loop Control Scheme

    Publication Year: 1986 , Page(s): 735 - 745
    Cited by:  Papers (19)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (4433 KB)  

    The myoelectric profile of an electrically stimulated muscle with separate and simultaneous control of firing rate and recruitment was determined. The signal consists of low amplitude, desynchronous discharge at low recruitment levels and exhibits monotonic, distinct compound action potentials at moderate to full recruitment. The myoelectric signal-force model is described by sigmoidal function when the signal is represented by its median frequency (MF), rms, or mean absolute value (MAV) at firing rates inducing just above fused force response (~28 pps). At firing rates corresponding to the maximal tetanic force of the muscle (~51 pps) the MES-force model is represented by a second-order polynomial for MF, rms, and MAV. Dynamic tracking of force induced by a sinusoidal recruitment/derecruitment of the muscle's motor unit pool at frequencies in the range of 0-1 Hz show that the MAV is independent, whereas the rms and MF are dependent on tracking frequency. The linearized MAV-force model was found superior for use as a sensorless force feedback measurement in a closed-loop control scheme aimed at restoration of regulated movement to a paralyzed limb joint. View full abstract»

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  • Quantification of Interaction Between ELF-LF Electrc Fields and Human Bodies

    Publication Year: 1986 , Page(s): 746 - 756
    Cited by:  Papers (23)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (3689 KB)  

    A numerical method, based on surface-charge integral equations, has been developed to quantify the interaction of ELF-LF electric fields with a human body that has a realistic shape and arbitrary posture and is situated in a realistic environment. The induced electric fields at the body surface and inside the body, the induced body current, and effects of the grounding impedance can be accurately quantified by the present method. The agreement between the method and various existing experimental data is very good. View full abstract»

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  • Currents Induced in a Human Being for Plane-Wave Exposure Conditions 0-50 MHz and for RF Sealers

    Publication Year: 1986 , Page(s): 757 - 767
    Cited by:  Papers (23)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2776 KB)  

    The currents induced in a human being were measured for plane-wave exposure conditions 0-50 MHz. These are used to point out that very large SAR's may be set up in the wet tissues for the cross section of the ankle for standing human beings exposed to electric fields suggested in the ANSI C95.1-1982 RF safety guide. For these exposure conditions, foot currents on the order of 627 mA are projected for a human adult of height 1.75 m for the frequency band 3-30 MHz with the value increasing to 780 mA for 40 MHz. The corresponding ankle-section SAR's are 182 and 243 W/kg. Using electromagnetic scaling concepts, SAR's as high as 371 and 534 W/kg are projected for ten- and five-year old children, respectively, for f = 50.7 and 62.5 MHz, E = 61.4 V/m (1 mW/cm2) recommended by the ANSI C95.1-1982 RF safety guide. The paper also gives currents induced by two sealer models and three industrial RF sealers for a human being under grounded and insulated conditions. Though smaller than those for plane-wave irradiation conditions, these currents may be substantial for high leakage fields that are quite typical. View full abstract»

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  • Design and Construction of a Pulsed Ultrasonic Air Flowmeter

    Publication Year: 1986 , Page(s): 768 - 774
    Cited by:  Papers (15)  |  Patents (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (4625 KB)  

    The construction and specific function of a new ultrasonic flowmeter are described. The mean velocity of the respiratory air flow is calculated by measuring the transit times of short ultrasonic pulse-trains simultaneously transmitted upstream and downstream at a 650 Hz rate. The flowmeter system consists of a control unit and a separate flowhead. The former includes the power supplies, a controlling microprocessor, most of the signal processing circuitry, and three analog outputs for flow, volume, and temperature, respectively. The flowhead contains the respiratory tube with a constant circular cross section (length 90 mm, diameter 20 mm, dead space 35 cm3), a fast temperature sensor, two electronic circuits for processing of flow and temperature data, and a sound transmission channel with two capacitive ultrasonic wide-band transducers. This respiratory air flowmeter is extremely fast (response time 1-2 ms) and accurate, with low noise (below 9ml/s), with a wide flow range (bidirectional from 0 to 9 l/s) and with a linear frequency response up to 70 Hz. View full abstract»

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  • Interpretation of the Coherence Function When Using Pseudorandom Inputs to Identify Nonlinear Systems

    Publication Year: 1986 , Page(s): 775 - 779
    Cited by:  Papers (8)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (815 KB)  

    Use of certain types of pseudorandom input stimuli to identify linear transfer function models of biological or physiological systems can lead to bias errors if the system is nonlinear. Moreover, use of the coherence function to assess the linearity of the system may yield misleading results. Results from a computer simulation are presented, along with example experimental data. View full abstract»

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  • A Universal and Inexpensive Servomotor for Vestibular Research

    Publication Year: 1986 , Page(s): 779 - 783
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1070 KB)  

    Rotations of any type over 300°in the horizontal plane are produced by this motor controller for vestibular research. This dc motor produces 1.28 N ·m(0.94 ft ·Ib) of torque and is powered by a pulse-width-modulated (PWM) amplifier. Turntable angle is fed back via a potentiometer. For large movements, the motor produces maximum torque for acceleration and maximum reverse torque for deceleration (bang-bang control). When the error is small, linear control is used. For a monkey and turntable of 0.31 kg ·m2 inertial load, the motor produces 240°/s2 acceleration. The system costs $ 450. View full abstract»

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  • Time Domain Resolution of Forward and Reflected Waves in the Aorta

    Publication Year: 1986 , Page(s): 783 - 785
    Cited by:  Papers (25)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (704 KB)  

    A simple, fast time domain method for the resolution of aortic pressure and flow pulses into their forward and reflected components is presented. Accuracy of the method depends on the estimation of characteristic impedance and the frequency responses of the transducer systems. View full abstract»

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  • A Perinatal Monitoring Display Based on the Fetal Topogram

    Publication Year: 1986 , Page(s): 785 - 792
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1486 KB)  

    One of the fundamental snags often encountered in the development of expert systems is the difficulty of effective liaison between the knowledge engineer and the specialists for whom the system is designed, especially when the latter have no engineering background. In our case, this problem has arisen in the course of working towards a comprehensive system for the automatic diagnosis and prognosis of fetal condition during labor, an important task which has traditionally been carried out by visual inspection of fetal heart rate and uterine pressure traces. Although the use of syntactic pattern recognition methods has enabled the system as it stands to achieve success rates of around 95 percent, its further improvement hinges on case-by-case interaction with obstetricians untrained in the concepts of discriminant analysis or formal grammar. View full abstract»

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  • Comparison of a Set of Power Distribution Parameters for Intraoperative EEG Monitoring

    Publication Year: 1986 , Page(s): 792 - 795
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (939 KB)  

    This study was conducted to compare the relative performance of 19 univariate EEG power distribution parameters in terms of their sensitivity to changes in the background (stationary) EEG activity and insensitivity to broad-band interference. Each of the parameters partitioned the power spectrum into two frequency subbands, each subband containing a fixed specific percentage of the total power. The EEG signals recorded from ten patients during induction with thiopental sodium were used in the study. Two sensitivity functions were defined to compare the sensitivity of the parameters to the effects of thiopental sodium. Parameter changes were compared to bandwidth changes during induction to evaluate their sensitivity to broad-band interference. The results of the study showed that the parameters in the middle of the percentile scale were more sensitive to background EEG changes produced by thiopental sodium than were those at either end of the scale. Sensitivity to broad-band interference was found to be directly proportional to percentile. Within the limits of this study, a parameter between the 25th and 30th percentiles would be the most suitable parameter to monitor intraoperatively. View full abstract»

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  • Noninvasive Measurement of the Volume Elastic Modulus in Finger Arteries Using Photoelectric Plethysmography

    Publication Year: 1986 , Page(s): 795 - 798
    Cited by:  Papers (10)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (897 KB)  

    A method for the nonivasive measurement of the volume elastic modulus (Ev) in human finger arteries was developed. The volume change ratio and pulse pressure in the arteries were simultaneously determined by a transmittance type infrared photoelectric plethysmograph and a volume oscillometric sphygmomanometer using an occlusive cuff. The Ev values could be obtained at a desired transmural pressure level of the arteries which was controlled by the cuff. A clear difference was revealed between the Ev values obtained in the fingers of two male subjects of 33 and 65 years old. The values determined by this method were compared to those calculated from pulse wave propagation velocity (Evp) obtained simultaneously in the fingers of 11 subjects. The linear regression equation was Ev = 1.31 Evp ¿0.117 with a correlation coefficient r = 0.893 (n = 39). These results suggest that this should be a useful and noninvasive method of evaluating changes in arterial elasticity accompanying aging and perhaps influenced by accompanying hypertension or arteriosclerosis. View full abstract»

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  • Comments on "Dielectric Properties of Solid Tumors During Normothermia and Hyperthermia"

    Publication Year: 1986 , Page(s): 799
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    First Page of the Article
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  • Authors' reply2

    Publication Year: 1986 , Page(s): 799 - 800
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    First Page of the Article
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  • In Vivo Electrical Stimulation Using Multichannel Photolithographic Electrode Atrays

    Publication Year: 1986 , Page(s): 800 - 803
    Cited by:  Papers (2)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (683 KB)  

    Multichannel electrical stimulation of the auditory nerve is demonstrated in a cat model using photolithographic electrode arrays. Evoked potentials from the auditory cortex are used to map the location of fibers activated by different electrodes in the array. The evoked responses obtained are equivalent to those produced by fine wire electrodes currently used for functional stimulation of the auditory system. View full abstract»

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  • Conversion Between Plethysmograph and Perturbational Airways Resistance Measurements

    Publication Year: 1986 , Page(s): 803 - 806
    Cited by:  Papers (4)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (689 KB)  

    Equations were developed for airway pressure-flow characteristics which were then used to illustrate differences between airflow perturbation device measurements and body plethysmographic airways resistance measurements. The general conclusions indicate that perturbational resistances may be able to be reformulated as plethysmographic resistances, yielding information where the body plethysmograph itself is not well suited. View full abstract»

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  • Correction to "An Integrated Sensor for Electrochemical Measurements"

    Publication Year: 1986 , Page(s): 806
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  • Announcement and Call for Papers IEEE and SPIE's International Symposium on Pattern Recognition and Acoustical Imaging

    Publication Year: 1986 , Page(s): 807
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    Freely Available from IEEE
  • Call for Papers Special Transactions Issue on Biomedical Robotics

    Publication Year: 1986 , Page(s): 808
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    Freely Available from IEEE
  • IEEE Transactions on Biomedical Engineering Statement of Editorial Policy

    Publication Year: 1986 , Page(s): 808-a
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    Freely Available from IEEE
  • Institutional listings

    Publication Year: 1986 , Page(s): 808b
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    Freely Available from IEEE

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