By Topic

Engineering in Medicine and Biology Society, 1989. Images of the Twenty-First Century., Proceedings of the Annual International Conference of the IEEE Engineering in

Date 9-12 Nov. 1989

Filter Results

Displaying Results 1 - 25 of 1021
  • Images of the Twenty-First Century. Proceedings of the Annual International Conference of the IEEE Engineering in Medicine and Biology Society (Cat. No.89CH2770-6)

    Publication Year: 1989
    Request permission for commercial reuse | PDF file iconPDF (60 KB)
    Freely Available from IEEE
  • A cardiac gating device for MRI system

    Publication Year: 1989, Page(s):601 - 602 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (133 KB)

    An electrocardiograph (ECG) sensing device which is compatible with a magnetic resonance (MR) imager is described. It is used to synchronize the imaging sequences with a specific phase of the cardiac cycle. It is designed to detect the ECG signal and to generate a MR-sequence triggering pulse. Noise and artifacts induced by the radio-frequency pulses and magnetic field gradients inherent in MR ima... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Parallel processing and computational chemistry

    Publication Year: 1989
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (35 KB)

    Summary form only given, as follows. With the increasing use of such methods as dynamic simulations, free energy perturbation and large-molecule ab initio calculations, chemical researchers find increasing frustration in the use of conventional computers to solve their problems. These machines are either too slow or too expensive to be practical for everyday use. However, the advent of parallel co... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Motion estimation in digital subtraction angiography

    Publication Year: 1989, Page(s):567 - 568 vol.2
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (192 KB)

    The estimation of coronary vessel motion from a sequence of digital subtraction angiographic (DSA) images is presented. It is carried out by means of a gradient-based method along the arterial centerlines from two successive images. To extract the centerlines from all the DSA images of a sequence, an automatic, model-guided, frame-to-frame feature extraction approach is used, in which the estimate... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Evaluation of a heuristic approach to estimate motor conduction velocity distributions of peripheral nerves

    Publication Year: 1989, Page(s):1245 - 1246 vol.4
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (144 KB)

    A procedure for estimating the motor conduction velocity distribution of peripheral nerves is proposed. The distribution is estimated by fitting a single representative potential to the maximal stimulus-evoked muscle potential in a least-squares fashion. The results obtained for the case of a muscle consisting of 150 motor units are presented. In this example, the estimated distribution closely ma... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Acoustic plate-wave biosensing

    Publication Year: 1989, Page(s):1108 - 1109 vol.4
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (108 KB)

    The biosensing potential of a flexural plate-wave delay-line oscillator is described. Experimental results confirm theoretical predictions that the sensor can operate in contact with a liquid and still detect small changes in membrane mass. A response to adsorbed proteins is observed as a prelude to the detection of specific biomolecular reactions and implies that the sensor can be used to monitor... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • An information flow technique in ERP application

    Publication Year: 1989, Page(s):715 - 716 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (372 KB)

    A technique is reported for studying interactions among many subsystems of a biological system. A general mathematical technique is developed for information flow among various subsystems of a system when two or more classes of stimuli are presented to the system. The technique was validated by various simulation studies and then applied to a brain system. The usefulness of the technique is report... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A new method for identification and classification of human wrist bones in CT

    Publication Year: 1989, Page(s):386 - 387 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (204 KB)

    A system designed for the purpose of segmenting and classifying the bones present in computed tomography (CT) images of the human wrist is described. The classification scheme presented is new in its treatment of the cost penalty associated with an incorrect classification. The analysis of an image is carried out in two stages: the segmentation stage and the classification stage. The segmentation ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Surgical alterations and functional neuromuscular stimulation for enhancement of hand function in spinal cord injury

    Publication Year: 1989, Page(s):1496 - 1497 vol.5
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (152 KB)

    Surgical alterations were combined with functional neuromuscular stimulation to enhance hand function in the patient with high-level spinal injury. These alterations are: thumb interphalangeal joint arthrodesis, finger tendon synchronization, and tendon transfer of muscles with upper motor neuron lesions. These procedures resulted in more uniform movement of the digits, generation of movement unav... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Inverse epicardial potential solutions with an isolated heart preparation

    Publication Year: 1989, Page(s):193 - 194 vol.1
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (148 KB)

    An isolated dog heart preparation placed in a cylindrical tank filled with a physiological solution was designed, forming a simplified heart-torso model. Epicardial and cylinder potentials were recorded for several sequences of excitation and repolarization. The boundary element method was used to construct a transfer matrix relating cylinder to epicardial potentials. Inverse epicardial potential ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A novel delivery for laser thermal recanalization

    Publication Year: 1989, Page(s):1190 - 1191 vol.4
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (92 KB)

    A description is given of a fiberoptic laser delivery system (Laserprobe) developed for the treatment of occlusive vessel disease. This delivery system provides a means for converting laser energy into localized thermal energy, and for conducting the generated heat to the diseased tissue upon contact. The temperature of the heat generating element at the Laserprobe tip has been monitored during cl... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Exploring neuromotor control of the forearm reaction to perturbation

    Publication Year: 1989, Page(s):951 - 952 vol.3
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (184 KB)

    The authors used a sixth-order, two-muscle model of the human forearm position control system to simulate for arm position responses to impulsive torque perturbations. State feedback of muscle length, contraction velocity, and torque model spinal reflex control, while supraspinal control is manifested by changes in feedback gains. Model responses optimized for a time-optimality performance criteri... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • BAEP enhancement by weighted ensemble averaging

    Publication Year: 1989, Page(s):713 - 714 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (104 KB)

    A method of enhancing the lower frequency components of the brainstem auditory evoked potential (BAEP) and consequently reducing the number of sweeps required for a suitable signal-to-noise-ratio is presented. The algorithm, methods, and experimental results are discussed. The results suggest that some single-sweep signal components have polarities that are opposite to the ensemble average polarit... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A multi-wavelength thermal imaging system

    Publication Year: 1989, Page(s):1153 - 1154 vol.4
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (144 KB)

    The design and construction of a four-wavelength digital thermal imager, with additional visible imaging capabilities, has been undertaken. Use of common focusing optics ensures image register and identical perspective at each of the wavelengths. The detector assembly for the multiwavelength system consists of a linear array of MCT photoconductive elements mounted in a single Dewar for liquid nitr... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Spectral estimation properties of nonlinear auditory models for noisy signals

    Publication Year: 1989, Page(s):679 - 680 vol.2
    Cited by:  Papers (3)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (144 KB)

    The simulation of an auditory model of the inner ear including the nonlinear transduction of the auditory nerves is discussed and a scheme of cortical processing is proposed. The output of the last stage of the model, called the ensemble interval histogram (EIH), is a cortical representation of speech in both time and frequency, similar to a spectrogram. A statistical analysis of the output of thi... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Computer simulation of defibrillating electric shocks: critical mass

    Publication Year: 1989, Page(s):75 - 76 vol.1
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (452 KB)

    Computer simulations of the propagation of depolarizing waves through the ventricular wall based on the Huygens principle are presented. Permanent troubles induced by unidirectional blocks are simulated. A critical size of a unidirectional block required in order to trigger a reentry for normal and ischemic tissues is calculated. The influence of anisotropic conduction on the initialization of ree... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Metalloproteins thin films

    Publication Year: 1989, Page(s):1315 - 1316 vol.4
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (108 KB)

    The structure and orientation of metalloproteins adsorbed onto semiconductor and metal surfaces were investigated. X-ray photoelectron spectroscopy (XPS) techniques were used in conjunction with novel myoglobin derivatives. In these myoglobin derivatives, a pentammine ruthenium (III) group is attached to specific histidine residues on the protein surface. The Fe-Ru distance in these derivatives wa... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Breast carcinomas: prognosis assisted by computer image analysis

    Publication Year: 1989, Page(s):347 - 348 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (124 KB)

    Summary form only given. The results of a study of the smears of 159 patients with invasive ductal adenocarcinomas are reported. Image cytometry of estrogen receptor immunolabeling and DNA distribution in the smears was carried out. Software was developed to analyze routine preparations and to estimate objectively the tumor heterogeneity. A calculated parameter highly correlated with biochemical a... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Physiological responses to FNS exercise in SCI children

    Publication Year: 1989, Page(s):1498 - 1499 vol.5
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (136 KB)

    Maximal physiological responses during voluntary arm cranking exercise (ACE) are compared with responses for two modes of exercise elicited by functional neuromuscular stimulation of the paralyzed lower extremities (FNS-LE) of four T5-T7 paraplegic boys, aged 15 to 17 years. Simultaneous percutaneous stimulation of the gluteal and quadriceps muscles in combination with ACE yields a hybrid exercise... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Study of the bidimensional blood flow in a tapered vessel by means of an original mathematical model

    Publication Year: 1989, Page(s):868 - 870 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (156 KB)

    The influence of arterial tapering on blood motion is evaluated. This was achieved by means of a nonlinear mathematical model that allows local study of the motion of fluid in a tapered and elastic tube. The results make it clear that the anatomic tapering of arteries and pulsatile changes in diameter highly influence blood motion. A nonlinear model for studying arterial blood motion is presented.... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Angioscopy-design considerations and preliminary results with the ACS angioscope

    Publication Year: 1989, Page(s):1192 - 1193 vol.4
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (104 KB)

    The engineering requirements for designing a safe and effective percutaneous coronary angioscope are reviewed. These requirements have been incorporated into a 4.3 French over-the-wire, steerable angioscope, which has been approved for sale as a diagnostic device and has been used successfully in clinical studies, Further clinical studies are underway to document the utility of the angioscopic inf... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Normal and shear interface stresses in lower-limb prosthetics

    Publication Year: 1989, Page(s):1443 - 1444 vol.5
    Cited by:  Papers (1)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (148 KB)

    Instrumentation for measuring normal stresses and biaxial shear stresses at the residual-limb/prosthetic-socket interface during ambulation is presented. Three-directional force transducers were designed using strain-gage technology. With an amplifier gain of 4000, shear and normal sensitivities are 0.132 V/kPa and 0.0259 V/kPa, respectively. Nonlinearity, crosstalk, noise, and drift are reported ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Real-time loading of the isolated heart with a wave transmission arterial model

    Publication Year: 1989, Page(s):112 - 113 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (116 KB)

    A technique for studying the real-time effects of arterial wave reflections on the performance of the isolated left ventricle was investigated. Real-time arterial loading of an isolated ferret heart with an asymmetric T-tube wave transmission model was obtained with the use of a multiprocessor computer system and a volume control linear motor pump. The multiprocessor computer system was programmed... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Obtaining skin contact force information from implanted nerve cuff recording electrodes

    Publication Year: 1989, Page(s):928 - 929 vol.3
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (188 KB)

    An investigation was conducted to determine how the electrical activity in a cutaneous nerve relates to the force applied on glabrous skin. Nerve cuff electrodes implanted on the tibial nerve of cats were used to record the electroneurogram (ENG) when the footpad was probed by a servo-controlled motor. The ENG signal was nonlinearly dependent on the applied force. It saturated for high forces, ada... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Finite element analysis of impedance models

    Publication Year: 1989, Page(s):1230 - 1231 vol.4
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (148 KB)

    The numerical solution of Poisson's equation, which describes the dielectric and/or conductive properties of biological tissue, is presented. Only two-dimensional problems are demonstrated; the third dimension is considered to be of unit length, with no boundaries at the two ends. The finite-element approach can handle any kind of nonisotropy and has the advantage that electrodes can be placed any... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.