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

9-12 Nov. 1989

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Displaying Results 1 - 25 of 1021
  • Evaluation of arterial pulse wave velocity on the basis of multivariate analysis

    Publication Year: 1989, Page(s):136 - 137 vol.1
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (182 KB)

    Two sets of photoplethysmographs were used to record arterial pulse waves. A linear predicting function that could predict pulse wave velocity (PWV) by means of age and blood pressure was obtained, and the values computed by this function were subtracted from the measured PWVs. These residuals of the normal subjects were compared with those of the patients in each disease category. The difference ... View full abstract»

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  • 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 (146 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»

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  • 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
  • Assessing the vertical sensitivity of plane arrays of electrodes

    Publication Year: 1989
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (104 KB)

    Summary form only given. In order to quantify the contribution of points located out of a plane array of electrodes in an impedance imaging system based on 2-D reconstruction algorithms, an in vitro experiment is carried out for a physical model. For each pertinent set of four electrodes the volume distribution of sensitivity is then mapped experimentally. The results show that surfaces of null se... View full abstract»

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  • Utilization of esophageal reference electrode to enhance impedance imaging

    Publication Year: 1989
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (107 KB)

    Summary form only given. The authors report on the results of an analysis of the expected improvement in distinguishability of target inhomogeneities when an esophageal reference electrode is located on the target-body interface. One-dimensional (1-D), two-dimensional (2-D) circular, and three-dimensional (3-D) spherical models were utilized for the evaluation. The results indicate an increase in ... View full abstract»

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  • Decrease of the influence of noise on precise CT-densitometry

    Publication Year: 1989, Page(s):2 - AP
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (106 KB)

    Summary form only given. The authors present the results of an experiment designed to reduce the noise in computed tomography density images. Noise was examined from a statistical point of view, and the minimal area required for reliable density measurement was determined. It was established that density measurement of slices 5- and 10-mm thick is reliable and repeatable with an error less than +o... View full abstract»

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  • Practical strategies for chemical shift imaging on a human MR imager

    Publication Year: 1989
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (93 KB)

    Summary form only given. Issues associated with the design and operation of clinical chemical shift imaging (CSI) protocols on a whole body scanner are discussed. Line volume CSI methods are compared to the echo offset, or Dixon, method. The potential sources of error for the Dixon method are examined. It is noted, however, that line volume CSI artifacts do not have the spatial resolution of conve... View full abstract»

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  • 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»

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  • Fast FLASH MRI

    Publication Year: 1989
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (65 KB)

    Summary form only given. Fast FLASH magnetic resonance imaging (MRI), which realizes acquisition times for MR images of less than 200 ms, is briefly described. Applications to kidney and liver imaging are discussed. Because of the short acquisition time, a series of fast images can be used to visualize motion, e.g. to obtain real-time cardiac images or to measure blood flow.<> View full abstract»

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  • Spatial analysis of EEG

    Publication Year: 1989, Page(s):691 - 692 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (109 KB)

    Summary form only given. An overview and evaluation of various methods of spatial analysis of EEG and evoked potentials are presented. Topics include multiple scales of neural sources, spline-generated surface Laplacians, and representation of surface potentials by orthogonal functions.<> View full abstract»

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  • Measurement of functional cortical networks of the human brain

    Publication Year: 1989
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (109 KB)

    Summary form only given. The author reports on a set of procedures called event-related covariance (ERC) analysis. Applying ERC analysis to simple cognitive tasks, he obtained clear-cut results that were consistent with prior neuropsychological models of the rapidly shifting cortical network accompanying expectancy, stimulus registration and feature extraction, response preparation and execution, ... View full abstract»

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  • Intersensory evoked brain potentials and intersensory psychophysics: a critical overview

    Publication Year: 1989, Page(s):700 - 701 vol.2
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (105 KB)

    Summary form only given. An overview is provided of the four key sensory dimensionalities (spatial, temporal, intensive and qualitative) of the four primary external senses: vision, audition, smell and touch. Some findings on intersensory evoked brain responses in normal children, bright dyslexia children and retarded children are reviewed.<> View full abstract»

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  • Contribution of cervical trabecular bone to the strength of the proximal femur

    Publication Year: 1989
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (66 KB)

    Summary form only given. An investigation has been carried out to assess the contribution of cervical trabecular bone to the strength of the proximal femur. Pairs of cadaveric femurs were radiographed and tested mechanically to determine the breaking strength. Before testing, the trabecular bone was removed from the neck of the left femur of each pair. Both oblique cervical and subcapital fracture... View full abstract»

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  • Early research on muscle sounds

    Publication Year: 1989
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (97 KB)

    Summary form only given. A survey of research on muscle sounds is presented, beginning with experiments dating back to 1665 and covering research through the 1900s. The early belief was that muscle sounds were due to the movement of animal spirits. W.H. Wollaston (1810) attributed muscle sounds to repetitions within the muscle mass of small contractions. According to H. Helmholtz (1867), the muscl... View full abstract»

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  • AMG and EMG spectra for mixed muscle fiber types

    Publication Year: 1989
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (54 KB)

    Summary form only given. The purpose of this study was to determine the effects of localized fatigue on the spectrum of the electromyograph (EMG) and acoustic myogram (AMG), which is largely subsonic in the human vastus lateralis (VL) muscle. Fourteen healthy, undergraduate men and women were tested for a maximum voluntary contraction (MVC) of the quadriceps group. On a subsequent day, fatigue was... View full abstract»

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  • Overview of biosensor design and fabrication

    Publication Year: 1989
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (83 KB)

    Summary form only given. The categories of materials and technologies available for designing and fabricating biosensors are briefly summarized. Different types of electrical, optical, and thermal transducers; antibody, nucleic, and membrane bioreceptors, signal-producing molecular labels and substrates; and bioreaction chemistries are reviewed.<> View full abstract»

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  • Design of interstitial ring-slot applicator for microwave hyperthermia

    Publication Year: 1989
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (73 KB)

    Summary form only given. The structure of a thin ring-slot applicator for microwave hyperthermia and a typical measured specific-absorption-rate (SAR) distribution are described. A high iso-SAR was obtained at the tip, but the distribution tailed off along the cable to the surface of the phantom. This is attributed to a reflected electric current flowing back along the outside of the cable. An equ... View full abstract»

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  • Detector systems for thermal imaging-a critical overview

    Publication Year: 1989
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (59 KB)

    Summary form only given. An overview and comparison was given of the most commonly used TV-compatible systems employing parallel and serial scanners. Also described were a variety of image processing techniques for image enhancement and operator aids.<> View full abstract»

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  • Advanced technology developments in quantitative thermography for space science (human perception and clinical diagnostics)

    Publication Year: 1989, Page(s):1156 - 1157 vol.4
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (117 KB)

    Summary form only given. The needs of the space program for quantitative thermography is reviewed and the implications of NASA's advanced development work in thermography and its relationship to human perception and clinical diagnostics are discussed, with emphasis on image information processing capabilities of representative observer vision systems. Areas in which further work is needed are iden... View full abstract»

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  • Digital thermal imaging system compatible with standard

    Publication Year: 1989
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (65 KB)

    Summary form only given. System configurations that produce line video output directly compatible with CCTV scan rates, rather than utilizing scan conversion electronic processors operating at scan frequencies that are different than the CCTV standard, are discussed. This represents a design philosophy that provides a very simple electronic subsystem at the expense of a sophisticated optical subsy... View full abstract»

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  • 'Synthetic metals': a novel role for organic polymers

    Publication Year: 1989
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (80 KB)

    Summary form only given. The basic chemistry and physics of polyacetylene, (CH)/sub x/, the prototype conducting polymer which is characteristic of most other conducting polymers, were described together with a description of the polyanilines, a large new class of conducting polymers. Potential technological applications were discussed. Polyacetylene, (CH)/sub x/ is obtained in the form of silvery... View full abstract»

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  • Defects in Langmuir-Blodgett films and their influence on electric properties

    Publication Year: 1989
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (97 KB)

    Summary form only given. The use of the Langmuir-Blodgett (LB) technique to construct various multilayered structures of potential use in molecular electronics is discussed. The defects in the films and their distribution have been studied mainly by investigating dislocations in the films and traps situated on both the impurities and the interfaces between the films and the substrates. To investig... View full abstract»

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  • Ultrasmall memories based on electron transfer reactions

    Publication Year: 1989
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (84 KB)

    Summary form only given. An electronic shift register memory at the molecular level is described. The memory elements are based on a chain of electron transfer molecules, and the information is shifted by photoinduced electron transfer reactions. This device integrates designed electronic molecules onto a very-large-scale integrated (silicon microelectronic) substrate, providing an example of a mo... View full abstract»

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  • Some methods for irreversible write-once recording in 'biochrom' films

    Publication Year: 1989
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (84 KB)

    Summary form only given. The data-storage capabilities of the photochromic material biochrom, a film based on bacteriorhodopsin (BR) embedded into a polymeric matrix, are described. The material is capable of recording optical information (upon exposure to light) with constant and reversible storage at high spatial resolution (>5*10/sup 3/ lines/mm), photosensitivity up to 10/sup -3/ J/cm/sup 2/, ... View full abstract»

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  • Multiple applications of the light addressable potentiometric sensor

    Publication Year: 1989
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (79 KB)

    Summary form only given. The light-addressable potentiometric sensor has been used to perform a variety of fundamentally different types of measurements. This versatility is primarily a function of the mechanical configuration of the sensor. Various mechanical configurations are discussed, including flow chambers, porous membrane contact sensors, and compartmentalized sensors for measuring electri... View full abstract»

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