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  • 1
    Electronic Resource
    Electronic Resource
    Frequency-dependent reflection from mechanical discontinuities (1987)
    Springer
    Medical & biological engineering & computing 25 (1987), S. 102-106 
    Details
    ISSN: 1741-0444
    Keywords: Dispersion ; Mechanical mismatch ; Pressure pulse ; Reflection
    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/BF02442831
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  • 2
    Electronic Resource
    Electronic Resource
    Reflection from elastic discontinuities (1983)
    Springer
    Medical & biological engineering & computing 21 (1983), S. 697-701 
    Details
    ISSN: 1741-0444
    Keywords: Elasticity ; Pressure pulse ; Propagation ; Reflection
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract Elastic mismatching is studied by an impulse technique. Elastic mismatches are created by joining two latex rubber tubes of the same internal diameter but different wall thickness. A short duration pressure impulse is generated at the entrance of the water-filled tube system and the transmission characteristics of the impulse are determined from a series of measurements along the tube system using a catheter-tip pressure manometer. This technique enables the magnitude and phase change of the reflection at the elastic discontinuity to be obtained. A number of tube combinations are examined and in all cases a good agreement is shown between the measured reflection coefficient and the value calculated theoretically.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02464032
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  • 3
    Electronic Resource
    Electronic Resource
    Impulse propagation in rubber-tube analogues of arterial stenoses and aneurysms (1985)
    Springer
    Medical & biological engineering & computing 23 (1985), S. 150-154 
    Details
    ISSN: 1741-0444
    Keywords: Aneurysm ; Attenuation ; Pressure impulse ; Reflection ; Stenosis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract Analogues of arterial stenoses and aneurysms were constructed from latex tubing containing inserts of various lengths, and with diameters and elastic properties that differed from those of the surrounding tube. A pressure impulse (duration 〈10ms). was generated at one end of the tube and its transmission and reflection were monitored at various points within the system using a catheter-tip manometer. The complex waveforms produced by multiple reflections from either end of the insert were analysed and compared with those generated by a numerical model in which the reflection sites were regarded as isolated junctions between two tubes of infinite length. There was close agreement between the synthesised and measured waveforms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02456752
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  • 4
    Electronic Resource
    Electronic Resource
    Role of viscosity in frequency-dependent reflection from discontinuities in liquid-filled tubes (1988)
    Springer
    Medical & biological engineering & computing 26 (1988), S. 483-488 
    Details
    ISSN: 1741-0444
    Keywords: Dispersion ; Fluid viscosity ; Pressure pulse ; Reflection
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Abstract The paper investigates the effect of fluid viscosity on wave reflection at sites of geometric and/or mechanical discontinuity in a system of liquid-filled tubes, when the transmission of pressure pulses along these tubes is governed by a linear medium wavelength (LMW) theory. This theory is capable of describing the propagation of pressure impulses that contain frequencies in the range 0–500 Hz. We derive formulae for the reflection coefficients at a junction between two dissimilar tubes and examine the influence of fluid viscosity on these coefficients. Over much of the frequency spectrum under consideration, viscosity changes the reflection coefficients very little. The influence of viscosity is significant, however, at frequencies below 1 Hz.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02441915
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