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Proceedings of the IEEE

Issue 9 • Date Sep 1988

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Displaying Results 1 - 22 of 22
  • Applications of VLSI circuits to medical imaging

    Publication Year: 1988 , Page(s): 1106 - 1114
    Cited by:  Papers (14)  |  Patents (3)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1224 KB)  

    The application of advanced VLSI circuits to medical imaging is explored. The relationship of both general-purpose signal processing chips and custom devices to medical imaging is discussed using examples of fabricated chips. In addition, advanced-aided design tools for silicon compilation are presented. Particular attention is given to the application of VLSI circuits to 3-D image display with ul... View full abstract»

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  • Lithotripter systems

    Publication Year: 1988 , Page(s): 1236 - 1246
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (956 KB)  

    Lithotripsy in its various forms has revolutionalized the treatment of kidney and ureter stones. In extracorporeal lithotrips, pulsed acoustic shock waves are generated outside the body and focused via a coupling medium to the concrement. The location of the focus is controlled by fluoroscopy of ultrasound imaging. Starting from simplified models, two methods for generating shock wave pulses are d... View full abstract»

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  • An efficient multiplexing technique for packet-switched voice/data networks

    Publication Year: 1988 , Page(s): 1254 - 1256
    Cited by:  Patents (4)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (168 KB)  

    The authors propose a multiplexing frame structure that makes it possible to transmit voice messages synchronously without loss or clipping of contents. This scheme has discrete delay characteristics, and provides a simple play-out method for reproduction of voice signal. The authors investigate its performance by obtaining the cumulative distribution of delay of voice packets and the mean waiting... View full abstract»

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  • Electrical stimulation of excitable cells-a model approach

    Publication Year: 1988 , Page(s): 1122 - 1129
    Cited by:  Papers (6)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (648 KB)  

    The authors provide an introduction to the study of the quantitative response of excitable cells to stimulating currents through the use of mathematical models. Considered is the behavior of a spherical cell in a uniform field and a circular fiber in a point source field, where, for simplicity, only steady-state solutions are included. In each case a characteristic length is associated with the ce... View full abstract»

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  • Multidimensional ultrasonic imaging for cardiology

    Publication Year: 1988 , Page(s): 1063 - 1073
    Cited by:  Papers (28)  |  Patents (43)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1416 KB)  

    Previous extensions of two-dimensional ultrasonic imaging to three dimensions used lattice diagrams which give measurement information, but no anatomic detail. The authors conducted three sets of experiments to test the hypothesis that complete acoustic backscatter data should be retained to produce useful information about heart structure and function. First, in vitro compound B-scans were taken ... View full abstract»

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  • Applied neural control in the 1990s

    Publication Year: 1988 , Page(s): 1115 - 1121
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (700 KB)  

    The authors describe some of the current neural prostheses and examine technological developments needed for future generations of neural prosthetic implants. Current developments include the peroneal nerve stimulator, upper and lower extremity functional neuromuscular stimulation and the auditory prosthesis. Three issues connected with future developments include stimulating and recording electro... View full abstract»

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  • Implantable defibrillator with high-output pacing function after defibrillation

    Publication Year: 1988 , Page(s): 1187 - 1193
    Cited by:  Patents (3)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (484 KB)  

    An experimental implantable defibrillator with a temporary pacing function was developed. The pacing function was activated after defibrillation to work as a high-output ventricular-demand pacemaker. The developed system was tested in animal experiments involving anesthesized and mechanically ventilated mongrel dogs. In the animal experiments, fibrillation was electrically induced, and the automat... View full abstract»

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  • Linear-predictive data extrapolation narrow-band spectral estimation

    Publication Year: 1988 , Page(s): 1249 - 1251
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (272 KB)  

    It is demonstrated that T.J. Ulrych et al.'s (J. Geophys., Res., vol.78, p.4959-64, 1973) hybrid Fourier-Burg method of narrowband spectral estimation has significant advantages which may have been overlooked. Apart from improved resolution in comparison to the conventional Fourier approach, it also exhibits reduced sensitivity to model order compared to the Burg maximum-entropy-method algorithm. ... View full abstract»

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  • Speech processors for cochlear prostheses

    Publication Year: 1988 , Page(s): 1143 - 1154
    Cited by:  Papers (12)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1152 KB)  

    The authors review considerations in the design of speech processors for cochlear prostheses. To illustrate issues of processor design, two fundamentally different processing strategies are described in terms of the information that they can convey and in terms of how they might perform under various conditions on nerve survival. A summary is presented of clinical tests comparing these strategies ... View full abstract»

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  • Neural aspects of vision and related technological advances

    Publication Year: 1988 , Page(s): 1130 - 1142
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1216 KB)  

    The author examines the physiological aspects of the visual systems of animals and humans and several models that explain or try to explain physiological or psychophysical data. Particular attention is given to the decomposition of patterns by the human brain. Both digital and analog implementations are discussed and some projections to future applications are also mentioned. The development of a ... View full abstract»

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  • On the use of pitch power spectrum in the evaluation of vocal tremor

    Publication Year: 1988 , Page(s): 1166 - 1175
    Cited by:  Papers (2)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (628 KB)  

    A point process model of the speech excitation wave for sustained vowels has been formulated, where the pitch is modulated by a physiological disturbance (vocal tremor). It has been demonstrated that the power spectrum of an impulse train, representing the glottal pulses, is composed of a periodic replication of the spectrum of the modulating signal, accompanied by an impulse train at the carrier ... View full abstract»

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  • Recent advances in magnetic resonance

    Publication Year: 1988 , Page(s): 1095 - 1105
    Cited by:  Papers (5)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1208 KB)  

    The author describes some advances in magnetic resonance imaging which have been made in approximately the last two years. These are in general areas of improved speed of image acquisitions, improved spatial resolution, selective imaging of blood vessels, and reduction of image artifact View full abstract»

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  • Millimeter-wave propagation through a terrestrial atmosphere

    Publication Year: 1988 , Page(s): 1251 - 1254
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (208 KB)  

    At millimeter-wave frequencies, the terrestrial atmosphere is absorptive, dispersive, and inhomogeneous. Because it is inhomogeneous, rays are bent by refraction, and because it is dispersive, the amount of bending depends on the frequency. Thus the path length between two terminals depends on frequency, which means that there is an additional frequency distortion to be accounted for. The author d... View full abstract»

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  • Control aspects of intraaortic balloon pumping: an overview

    Publication Year: 1988 , Page(s): 1210 - 1217
    Cited by:  Papers (7)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (672 KB)  

    Temporary or permanent, internal or external, in-series or bypass cardiac assist devices are examined with emphasis on intraaortic balloon pumping. Physiological and clinical consequences of the medical assistance are discussed. Major advantages of the devices are to provide adequate perfusion and, secondarily, to unload the heart and to reduce oxygen consumption of the failing myocardium. Major p... View full abstract»

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  • Biomedical sensors in interventional systems: present problems and future strategies

    Publication Year: 1988 , Page(s): 1218 - 1225
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (848 KB)  

    The authors consider important problems in biomedical sensor development, including physical configuration, packaging connection to the remaining system, power supply, simultaneous sensing of multiple variables, signal processing, and costs. In addition to using conventional sensing technologies, biomedical sensors have recently incorporated microelectronic, signal processing, and optical techniqu... View full abstract»

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  • Measurement of defibrillation shock potential distributions and activation sequences of the heart in three dimensions

    Publication Year: 1988 , Page(s): 1176 - 1186
    Cited by:  Papers (19)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1060 KB)  

    The authors note that knowledge of the extracellular potential gradient field of the defibrillation shock and the cardiac-tissue response to the shock should lead to better understanding of the mechanism of defibrillation and stimulate improvement of defibrillation techniques. By measuring the potential distribution of the defibrillation shock throughout the heart and the location of the recording... View full abstract»

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  • High resolution intravascular imaging via ultrasonic catheters: proof of concept

    Publication Year: 1988 , Page(s): 1074 - 1078
    Cited by:  Patents (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (888 KB)  

    The potential image quality and resolution of medical ultrasonic imaging catheters (UIC) for use in minimally invasive determinations of vascular disease was examined with the aid of a prototype, small-aperture, high-resolution imaging system. The value of high-resolution ultrasonic imaging derives from the potential ability to quantitate intimal roughening, `see' beyond the intimal lining of the ... View full abstract»

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  • Fast sequential least squares design of FIR filters with linear phase

    Publication Year: 1988 , Page(s): 1247 - 1248
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (136 KB)  

    The authors propose a fast adaptive least-squares algorithm for linear-phase finite-impulse-response (FIR) filters. The algorithm requires 10m multiplications per data point where m is the filter order. This reduced computation stems from the fast adaptive forward-backward least-squares method. Both linear-phase cases i.e. with constant phase delay and with constant group delay, ... View full abstract»

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  • Control of functional neuromuscular stimulation systems for standing and locomotion in paraplegics

    Publication Year: 1988 , Page(s): 1155 - 1165
    Cited by:  Papers (45)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1388 KB)  

    The authors adopt a control-systems perspective in reviewing past applications of functional neuromuscular stimulation for providing lower extremity motor function in paralyzed individuals. Specifically, their approach emphasizes direct computer-controlled electrical stimulation of paralyzed muscle rather than triggering reflexes. In experimental settings it provides paralyzed individuals with the... View full abstract»

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  • Tomographic radiopharmaceutical imaging

    Publication Year: 1988 , Page(s): 1079 - 1094
    Cited by:  Papers (7)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (1632 KB)  

    Tomographic radiopharmaceutical imaging, or emission computed tomography (ECT), provides in vivo three-dimensional maps of a pharmaceutical labeled with a gamma-ray-emitting radionuclide. ECT has developed in two complimentary directions based on the type of radionuclide that is used. Positron emission computed tomography (PET) detects the two coincident 511-keV annihilation photos from position e... View full abstract»

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  • Cerebrospinal fluid control system

    Publication Year: 1988 , Page(s): 1226 - 1235
    Cited by:  Papers (1)  |  Patents (15)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (620 KB)  

    An implantable, therapeutic system for hydrocephalus, with an noninvasively adjustable flow valve and a telemetered intracranial pressure (ICP) and cerebrospinal fluid (CSF) flow is presented. The system contains an implant unit, a patient unit, and a physician's console. This system provides an improved shunt system for the better treatment of hydrocephalus, accommodates changing patient needs wi... View full abstract»

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  • Development of an automatic implanted drug infusion system for the management of cardiac arrhythmias

    Publication Year: 1988 , Page(s): 1204 - 1209
    Cited by:  Papers (4)  |  Patents (5)
    Save to Project icon | Request Permissions | Click to expandAbstract | PDF file iconPDF (600 KB)  

    Conventional management of cardiac arrythmias relies on oral drug therapy which minimizes recurrence of the arrhythmia, but risks unpleasant side effects and even long-term toxicity. The authors propose acute management instead, from an implanted drug pump which automatically senses the onset of arrhythmia, delivers a pharmacokinetically-based infusion to terminate the episode, and discontinues dr... View full abstract»

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North Carolina State University