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  • 11
    Electronic Resource
    Electronic Resource
    High-speed time-domain spectrum analyser (1981)
    Springer
    Medical & biological engineering & computing 19 (1981), S. 247-249 
    Details
    ISSN: 1741-0444
    Keywords: Time-domain analyser
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02442723
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    Paper (German National Licenses)
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  • 12
    Electronic Resource
    Electronic Resource
    The effect of multiple transfers of immune serum on maturingSchistosoma bovis infections in calves (1994)
    Springer
    Parasitology research 80 (1994), S. 198-202 
    Details
    ISSN: 1432-1955
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract To investigate the role of humoral factors in immunity, serum from cattle with naturally acquired immunity toSchistosoma bovis was injected intraperitoneally into calves that had been infected 4 weeks earlier with 10,000S. bovis cercariae. Serum was injected weekly until 12 weeks post-infection to a total of 4,500 ml per calf and controls received normal serum or saline. No significant difference in worm or in faecal or tissue egg counts were seen in the three groups of recipients in spite of the observation that the serum donors had proved highly resistant to experimental challenge. In a second experiment, pre-infection or 4-, 8- or 12-week post-infection serum from donors given a single experimental infection with 10,000S. bovis cercariae was injected intraperitoneally into groups of calves that had been infected 4 weeks earlier with 20,000S. bovis cercariae. Injections were given weekly up to week 10 post-infection to a total of 2000–3500 ml serum per calf. In calves injected with immune serum there was a reduction in faecal and tissue egg counts and in the numbers of worms recovered as compared with the controls. In recipients of 8- and 12-week serum the reductions in faecal and tissue egg counts were higher than those in worm recovery, suggesting that 8- and 12-week post-infection sera contained factors capable of causing, in addition to worm death, suppression of worm fecundity. This provides further evidence of the importance of fecundity suppression in immunity to schistosomiasis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00932674
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    Paper (German National Licenses)
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  • 13
    Electronic Resource
    Electronic Resource
    Role of imaging parameters in phase mapping flow measurement (1994)
    Springer
    Magnetic resonance materials in physics, biology and medicine 2 (1994), S. 307-309 
    Details
    ISSN: 1352-8661
    Keywords: MR flowmetry ; phase mapping
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Physics
    Notes: Abstract The influences of several primary imaging parameters on flow measurements made by the magnetic resonance phase mapping technique have been studied. In cine phase mapping, the echo time and flip angle had minimal effect on the flow measurement. Velocity sensitivity, slice thickness, and slice position were found to have well-behaved effects on the flow measurements. Angulation of either the slice or the tube away from normal intersection significantly affected the flow measurement. Further, the effect differs with the axis of rotation of the slice. Compensation for tube angulation by slice angulation improves flow measurements. Phase mapping is, thus, most heavily affected by gradient-related parameters. Hard limits on the choice of imaging parameters are few, but appropriate choices can compensate for or prevent some systematic errors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01705259
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    Paper (German National Licenses)
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  • 14
    Electronic Resource
    Electronic Resource
    On methods for preprocessing direction Doppler signals to allow display of directional blood-velocity waveforms by spectrum analysers (1978)
    Springer
    Medical & biological engineering & computing 16 (1978), S. 549-553 
    Details
    ISSN: 1741-0444
    Keywords: Blood velocity ; Directional Doppler ; Spectrum analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Description / Table of Contents: Sommaire Décrit deux dispositifs de traitement préliminaire qui peuvent tous deux être utilisés avant l'analyse spectrale pour afficher sans ambiguïté les formes d'onde directionnelle de vitesse du sang par un appareil d'analyse spectral. Les détails de circuits intéressants sont présentés.
    Abstract: Zusammenfassung Es werden zwei Vorverarbeitungsanlagen beschrieben, von denen jede vor der Spektralanalyse verwendet werden kann, damit der Spektrumanalysator keine unklaren Blutgeschwindigkeitswellenformen anzeigt. Es werden wichtige Einzelheiten des Schaltkreises dargestellt.
    Notes: Abstract Two processors are described, either of which may be used before spectral analysis to allow unambiguous display of directional blood-velocity waveforms by the spectrum analyser. The relevant circuit details are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02457807
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    Paper (German National Licenses)
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  • 15
    Electronic Resource
    Electronic Resource
    A carotid imaging system utilising continuous-wave Doppler-shift ultrasound and real-time spectrum analysis (1978)
    Springer
    Medical & biological engineering & computing 16 (1978), S. 739-744 
    Details
    ISSN: 1741-0444
    Keywords: Carotid ; Doppler-shift ultrasound ; Imaging system ; Real-time analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract The ultrasound carotid vessel imager uses a continuous-wave Doppler flow detector on a hand-guided position sensing arm. The directionally separated flow signals are passed through a two channel audiofrequency real-time spectrum analyser to a microprocessor-controlled image memory and display. Transducer position defines memory address; image data (16 intensity levels) is set by the Doppler signal power detected within a preset broad frequency band. Early results are illustrated
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02442455
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    Paper (German National Licenses)
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  • 16
    Electronic Resource
    Electronic Resource
    Automatic test unit for alignment of directional Doppler velocimeters (1981)
    Springer
    Medical & biological engineering & computing 19 (1981), S. 359-360 
    Details
    ISSN: 1741-0444
    Keywords: Automatic test equipment
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02442558
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    Paper (German National Licenses)
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  • 17
    Electronic Resource
    Electronic Resource
    Digitiser/processor for extraction of clinical parameters from Doppler-shift waveforms (1980)
    Springer
    Medical & biological engineering & computing 18 (1980), S. 81-86 
    Details
    ISSN: 1741-0444
    Keywords: Blood flow ; Digitisation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract Blood flow detected by Doppler-shift velocimeters may be displayed using frequency analysers such as Spectrascribe (Medishield Corporation, London). To interpret these waveforms and produce rapid reliable diagnosis a digitiser/processor has been constructed. It is based on an Intel 4040 microprocessor and a Summagraphics magnetostrictive digitiser. Software is described that provides for operation either remotely via an RS232 interface or from the front panel of the instrument. Routines are provided for measurements of the various parameters used in Doppler-shift diagnosis plus general purpose area, distance and angle programs. Prompts are provided by an alphanumeric display, which also shows the relevant answer. The resulting equipment provides a simple, rapid and economic means of performing hitherto cumbersome measurements to be made routinely on a clinical basis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02442484
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    Paper (German National Licenses)
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  • 18
    Electronic Resource
    Electronic Resource
    Automated strain-gauge plethysmograph (1978)
    Springer
    Medical & biological engineering & computing 16 (1978), S. 554-558 
    Details
    ISSN: 1741-0444
    Keywords: Measurement ; Strain gauges
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Description / Table of Contents: Sommaire L'appareil qui en a résulté, un pléthysmographe automatique à extensomètre à deux voies basé sur des techniques de mesure de résistance absolue, est décrit dans l'article. Il s'agit d'un apparei compact facile à utiliser, assurant un auto-calibrage inhérent pour n'importe quel extensomètre et quelle que soit sa longueur, qui effectue automatique la mesure, du cycle étudié et donne un tracé graphique annoté des données mesurées ainsi que les résultats qu'il calcule à partir desdites données.
    Abstract: Zusammenfassung Das Endresultat, ein Plethysmograph mit automatischem, zweikanaligen Dehnungsmeßgerät, der auf der absoluten Widerstandsmessungstechnik basiert, wird im folgenden beschrieben. Dieses Gerät ist kompakt, leicht zu handhaben, hat eine eingebaute Selbsteichung für jedes Meßgerät und jede Länge dieses Meßgeräts, führt einen automatischen Meßzyklus aus und erzeugt beschriftete, grafische Druckkopien der Meßdaten zusammen mit den Resultaten, die es aus diesen Daten berechnet.
    Notes: Abstract An automatic 2-channel strain-gauge plethysmograph, based on an absolute resistance measurement technique, will be described in the paper. This device is compact, easy to use, provides inherent self-calibration for any gauge and any length of that gauge, automatically performs the measured cycle, and generates annotated graphical printouts of the measurement data, along with the results which it computes from that data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02457808
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    Paper (German National Licenses)
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