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  • 1
    Electronic Resource
    Electronic Resource
    Comparative reject analysis in conventional film-screen and digital storage phosphor radiography (1999)
    Springer
    European radiology 9 (1999), S. 1693-1696 
    Details
    ISSN: 1432-1084
    Keywords: Key words: Reject analysis ; Digital radiography ; Quality control
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract. The aim of this study was comparative analysis of rejected radiographs in conventional and digital radiology under the aspects number of rejected images and reasons for rejection. During 2 months waste films of conventional radiography were collected; in digital radiography each image-delete command at the postprocessing workstation was documented. Rejected images were analysed and assigned to four categories. The overall reject rate was 27.6 % in the conventional and 2.3 % in the digital department. Whereas in the conventional department the main reason for rejection was “exposure” and “others” (i. e. problems related to film handling), the main reason in the digital environment was “positioning”. The high exposure tolerance of digital systems markedly reduces the amount of faulty images. This is not only economically rewarding, but may also reduce unnecessary X-ray exposure of patients due to image retake.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003300050911
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    A mathematical model for fundamental regulation processes in the cardiovascular system (1993)
    Springer
    Journal of mathematical biology 31 (1993), S. 611-631 
    Details
    ISSN: 1432-1416
    Keywords: Regulation of the cardiovascular system ; Baroreceptor loop ; Autoregulation ; Parameter identification ; Linear-quadratic regulator problem Research supported by the Fonds zur Förderung der Wissenschaftlichen Forschung (Austria) under Grant P7670
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Abstract Based on the four compartment model by Grodins we develop a model for the response of the cardiovascular system to a short term submaximal workload. Basic mechanisms included in the model are Starling's law of the heart, the Bowditch effect and autoregulation in the peripheral regions. A fundamental assumption is that the action of the feedback control is represented by the baroceptor loop and minimizes a quadratic cost functional. Simulation results show that the model provides a satisfactory description of data obtained in bicycle ergometer tests.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00161201
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    Paper (German National Licenses)
    Fulltext
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