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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Informatik-Spektrum 10 (1987), S. 192-204 
    ISSN: 1432-122X
    Keywords: Digitale Bildverarbeitung ; Computer-Graphik ; dreidimensionale Darstellung ; medizinische Diagnostik ; Computertomographie ; Kernspintomographie ; Digital image processing ; Computer graphics ; Three-dimensional display ; Medical diagnostics ; Computer tomography ; Magnetic resonance tomography ; I.4 ; J.3
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Description / Table of Contents: Summary The classical imaging modalities in medicine deliver only two-dimensional views of a three-dimensional reality. Using techniques of image processing and computer graphics, it is possible to reconstruct medical objects from spatial image sequences and to show arbitrary views on a display screen. For this purpose the volume of primary data has to be segmented into the objects and a data structure suitable for the display operation has to be generated. The methods are described and illustrated with applications in diagnostic radiology, surgery, orthopedics, and anatomy. Finally the problems of implemention for routine application are discussed.
    Notes: Zusammenfassung Die klassischen medizinischen Abbildungsverfahren liefern nur zweidimensionale Ausschnitte aus einer dreidimensionalen Wirklichkeit. Mit Hilfe der digitalen Bildverarbeitung und der Computer-Graphik ist es jedoch möglich, medizinische Objekte aus räumlichen Bildfolgen zu rekonstruieren und wählbare Ansichten auf einem Bildschirm darzustellen. Zu diesem Zweck muß das Datenvolumen in die darzustellenden Objekte segmentiert und in eine für die Darstellung geeignete Datenstruktur übergeführt werden. Die Verfahren hierfür werden erläutert und mit Anwendungen aus der radiologischen Diagnostik, der Chirurgie, der Orthopädie und der Anatomie illustriert. Schließlich werden die Probleme der Implmentation für Routinezwecke diskutiert.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-0878
    Keywords: Digital image processing ; Seminiferous epithelium ; Spermatocytes ; Spermatogenesis ; Human testis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary With the use of a digital image-processing method three-dimensional reconstructions of the arrangement of spermatocytes in human seminiferous tubules were performed. With this method it was possible to investigate the cellular distribution in the tubule in nearly any given perspective and projection. In addition, by means of simple mathematical procedures, such as by transformation of Cartesian coordinates into cylindrical coordinates, it was possible to vary the shape of a reconstruction, i.e., to convert the cylindrical image of a tubular portion into a right-angled r-ϕ-z-representation. The present work not only confirms the existence of a complex helical plan of organization of the human seminiferous epithelium but also provides further aspects of the phenomenon of physiological germ-cell loss and its integration into the kinetics of spermatogenesis.
    Type of Medium: Electronic Resource
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