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Proceedings of the IEEE

Issue 3 • March 1983

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Displaying Results 1 - 25 of 31
  • [Front cover and table of contents]

    Publication Year: 1983, Page(s): c1
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  • Scanning the issue

    Publication Year: 1983, Page(s):291 - 292
    Cited by:  Papers (8)
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  • Applications of computerized tomography to diagnostic radiology

    Publication Year: 1983, Page(s):293 - 297
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3284 KB)

    Computerized tomography (CT) has revolutionized the practice of diagnostic radiology. The combination of greatly improved ability to distinguish between regions of similar X-ray absorption and the ability to separate overlying regions from each other has made possible the radiographic demonstration of many organs and disease processes that previously could be, at best, poorly demonstrated. CT of t... View full abstract»

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  • Cardiac computed tomography

    Publication Year: 1983, Page(s):298 - 307
    Cited by:  Papers (28)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3792 KB)

    Diseases of the heart and blood vessels represent one of the most challenging problems for advanced diagnostic imaging systems. Not only do these diseases represent the major medical problem of our time in terms of death, acute and chronic illness, and disability, but cardiac diagnosis involves complex technical difficulties due to rapid motion and the complex structure of the heart and cardiovasc... View full abstract»

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  • High-speed three-dimensional X-ray computed tomography: The dynamic spatial reconstructor

    Publication Year: 1983, Page(s):308 - 319
    Cited by:  Papers (73)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (5942 KB)

    Most X-ray CT scanners require a few seconds to produce a single two-dimensional (2-D) image of a cross section of the body. The accuracy of full three-dimensional (3-D) images of the body synthesized from a contiguous set of 2-D images produced by sequential CT scanning of adjacent body slices is limited by 1) slice-to-slice registration (positioning of patient); 2) slice thickness; and 3) motion... View full abstract»

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  • Single-photon emission computed tomography

    Publication Year: 1983, Page(s):320 - 329
    Cited by:  Papers (7)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3800 KB)

    The subject of singl-photon emission computed tomography (SPECT) is generally reviewed. The basic interaction processes of gamma rays in matter are outlined, and the formation of conventional gamma-ray images is described. We then outline the extension of these concepts to the formation of three-dimensional or tomographic images. Of particular concern in emission tomography, the effects of gamma-r... View full abstract»

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  • Computerized tomography with ultrasound

    Publication Year: 1983, Page(s):330 - 337
    Cited by:  Papers (56)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2019 KB)

    The mathematical basis for transmission computed tomographic imaging using straight-line reconstruction equations is discussed. Both narrow-band and broad-band solutions are described. The Born and Rytov methods are discussed and the Rytov inversion equation presented with some results. Problems with implementation of the method are mentioned. Backscatter reconstruction methods of seismology are d... View full abstract»

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  • An introduction to NMR imaging: From the Bloch equation to the imaging equation

    Publication Year: 1983, Page(s):338 - 350
    Cited by:  Papers (40)  |  Patents (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3897 KB)

    The emerging technology of NMR imaging is introduced here as a problem in system identification. We show how selected families of signals may be input into the system ("system," in this case, is almost synonymous with "patient") in order that the system's responses to these inputs may be directly interpreted in terms of the system parameters. Once identified, a raster display of the system paramet... View full abstract»

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  • Application of computerized tomography to radiation therapy and surgical planning

    Publication Year: 1983, Page(s):351 - 355
    Cited by:  Papers (17)  |  Patents (38)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2704 KB)

    Computerized tomography (CT) which permits imaging the internal anatomy in axial cross section, has had a major impact in medicine, primarily in the diagnostic area. The CT scans are also useful in determining the extent of disease which is important in selecting the appropriate therapy. For therapy, the CT scan is becoming important in planning a course of radiation therapy for a cancer patient a... View full abstract»

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  • Overview of computerized tomography with emphasis on future developments

    Publication Year: 1983, Page(s):356 - 372
    Cited by:  Papers (14)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2032 KB)

    The applications of computer-assisted, or comput(eriz)ed, tomography (CT) are reviewed. The major emphasis is on medical applications, but all relevant technical sciences are covered. A unified descriptive account of the underlying principles is presented (detailed reviews of algorithms and their mathematical backgrounds can be found elsewhere in this special issue). Deficiencies in existing hardw... View full abstract»

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  • Physical problems of computerized tomography

    Publication Year: 1983, Page(s):373 - 378
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (616 KB)

    A cross-sectional image of an object can be accurately reconstructed if its projections or line integrals are known at all angles. This fundamental and exciting property has been applied to a variety of applications, primarily in the area of medical imaging. In many cases, however, the physical measurements fail to accurately define the complete set of line integrals. This leads to inaccuracies an... View full abstract»

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  • Mathematical problems of computerized tomography

    Publication Year: 1983, Page(s):379 - 389
    Cited by:  Papers (12)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1099 KB)

    The data measured in computerized tomography; e.g., the X-ray attenuation in X-ray tomography or the resonance phenomena in nuclear magnetic resonance tomography, have to be processed to produce the pictures on which the diagnostic evaluation of the physician is based. This process consists of the solution of the following mathematical problem. The data depend on the searched-for distribution and ... View full abstract»

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  • Reconstruction algorithms: Transform methods

    Publication Year: 1983, Page(s):390 - 408
    Cited by:  Papers (192)  |  Patents (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2027 KB)

    Transform methods for image reconstruction from projections are based on analytic inversion formulas. In this tutorial paper, the inversion formula for the case of two-dimensional (2-D) reconstruction from line integrals is manipulated into a number of different forms, each of which may be discretized to obtain different algorithms for reconstruction from sampled data. For the convolution-backproj... View full abstract»

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  • Finite series-expansion reconstruction methods

    Publication Year: 1983, Page(s):409 - 419
    Cited by:  Papers (254)  |  Patents (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1060 KB)

    Series-expansion reconstruction methods made their first appearance in the scientific literature and in the CT scanner industry around 1970. Great research efforts have gone into them since but many questions still wait to be answered. These methods, synonymously known as algebraic methods, iterative algorithms, or optimization theory techniques, are based on the discretization of the image domain... View full abstract»

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  • Display of 3D information in discrete 3D scenes produced by computerized tomography

    Publication Year: 1983, Page(s):420 - 431
    Cited by:  Papers (43)  |  Patents (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2281 KB)

    Imaging modalities such as X-ray computerized tomography (CT), ultrasound CT, and nuclear magnetic resonance CT all produce sequences of slice images of internal structures of medical objects. Effective methods of displaying the 3D information in such images are essential to aid in both diagnosis and treatment of diseases. Two philosophically different approaches to the display problem have been p... View full abstract»

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  • Almost-periodic linear arrays

    Publication Year: 1983, Page(s):436 - 437
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (217 KB)

    A novel scheme is described here for the nonuniform placement of elements in a linear array. By leaving the constraints of the periodic-spacing domain and entering the larger domain of almost-periodic spacing, one is allowed additional degrees of freedom for optimizing the radiation characteristics of the array. View full abstract»

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  • High-frequency analysis of broad-band 0° hybrid-junction: Distributed parameter approach

    Publication Year: 1983, Page(s):438 - 439
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (184 KB)

    The broad-band 0° hybrid junction constructed with a twisted-wire transmission-line transformer is analyzed by using a distributed parameter approach, with the help of the transmission-line theory. Such an analysis provides some useful information concerning the behavior of the device at higher frequencies when the line length becomes comparable to a wavelength. View full abstract»

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  • A further comment on "Analysis of 0° hybrid junction constructed with broad-band transmission-line transformer"

    Publication Year: 1983, Page(s):439 - 440
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  • Harmonic generation due to ballistic electron transport in GaAs

    Publication Year: 1983, Page(s):440 - 441
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (188 KB)

    Harmonics produced by the nonlinearity in the current-voltage characteristics of a ballistic diode are studied for a GaAs sample of thickness 1 µm at 77 K under collision-free condition. Harmonic generation is found to be maximum at zero bias, the value for the second-harmonic current being 50 percent for a signal amplitude of 0.2 V. View full abstract»

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  • Convergence of polynomial least squares end-point and mid-point estimators

    Publication Year: 1983, Page(s):441 - 442
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (172 KB)

    In a recent corcespondence, Leskiw and Miller [1] obtained the variance of a least squares polynomial estimator, as function of the polynomial order, for a large number of equally spaced data points, when the estimate is for the end-point. A simpler proof is given, and the result is extended to the mid-point. A mid-point estimator may be of special interest since it exhibits the lowest variance. View full abstract»

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  • Load frequency sampled-data control with unknown deterministic power demand

    Publication Year: 1983, Page(s):442 - 443
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (205 KB)

    This letter presents a sampled-data load frequency control method using the Lyapunov function. The proposed method is designed so as to absorb the unknown deterministic power demand. A numerical illustration is presented in order to verify the practicality of the proposed method. View full abstract»

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  • Correction to "Error rate monitoring for digital communications"

    Publication Year: 1983, Page(s): 443
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  • CAI sourcebook

    Publication Year: 1983, Page(s):444 - 445
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    Freely Available from IEEE
  • Interconnected dynamical systems

    Publication Year: 1983, Page(s): 444
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    Freely Available from IEEE
  • Intuitive IC electronics, a sophisticated primer for engineers and technicians

    Publication Year: 1983, Page(s): 444
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    Freely Available from IEEE

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North Carolina State University