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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Estimation of cardiac output by a single breath method

Franks, Peter J. January 1985 (has links)
Many attempts have been made to quantify cardiac output using both invasive and non-invasive techniques. The results have generally been poorly reproducible and comparisons of techniques have yielded highly variable values. A single breath inert gas method was used in the study, since it offers several advantages over previous methods, chiefly its speed of measurement, and the controlled manner in which it is performed. The method observes the uptake of a semi-soluble inert gas (Freon-22) with respect to an insoluble marker, and calculates cardiac output (pulmonary flow) from the slope of the semi-soluble gas.
2

The development of biomedical instrumentation using backscattered laser light

Barnett, Nicholas James January 1990 (has links)
This thesis is concerned with the measurement of blood flow and oxygen saturation in the microcirculation using the techniques of laser Doppler flowmetry and pulse oximetry. An investigation of the responses of Doppler flowmeters using different signal processing bandwidths and laser sources revealed two major findings. Firstly, that careful choice of processing bandwidth is required in order to sample the whole range of possible Doppler frequencies present in the backscattered light. Secondly, that the choice of laser source is important in governing the output stability of a flowmeter. Another investigation focused on the evaluation of a dual channel laser Doppler flowmeter using both in vitro and in vivo models. It was demonstrated that the instrument permitted a useful method of obtaining flow information by comparing simultaneous responses at experimental and control sites. The choice of laser wavelength was investigated in a study to determine whether blood flow measurements are obtained from different depths within the skin tissue. The results indicate that some depth discrimination is obtainable using instruments operating at different wavelengths, however it is difficult to demonstrate the effect in vivo. In a separate study it was shown that pressure applied to the skin surface greatly affects the underlying blood flow. It is recommended that care has to be taken when positioning Doppler probes on the skin. A reflection pulse oximeter was developed using laser light backscattered from the skin. The instrument was evaluated in vitro and in vivo by comparing desaturation responses with a commercial transmission pulse oximeter. The reflection oximeter was demonstrated to reliably follow trends in oxygen saturation but several problems prevented instrument calibration. Finally, a device combining laser Doppler flowmetry with reflection pulse oximetry was developed and used in vivo to follow trends in blood flow and oxygen saturation from the same tissue sample.
3

Quantitative flow by magnetic resonance phase mapping

Summers, Paul Eugene January 1998 (has links)
No description available.
4

Flow behaviour and interactions of blood corpuscles in an annular vortex distal to a tubular expansion

Karino, Takeshi January 1977 (has links)
No description available.
5

In vivo measurements of the heat convection coefficient on the endocardial surface

Santos, Icaro dos 28 August 2008 (has links)
Not available / text
6

Tissue perfusion analysis through photoplethysmic methods

McVeigh, Lawrence James January 1979 (has links)
No description available.
7

Optimization of total cavopulmonary connection using geometry as the major

Goudy, Sean T. 05 1900 (has links)
No description available.
8

Quantification of valvular regurgitation by proximal isovelocity surface area and magnetic resonance imaging

Guenet, Frederique S. A. 08 1900 (has links)
No description available.
9

The effects of geometry on the flow fields in the pulmonary bifurcation : an in vitro study

Lynch, Patricia G. 12 1900 (has links)
No description available.
10

Velocity measurement with a 2 MHZ pulsed doppler ultrasound probe in normal and stenosed models of the carotid bifurcation

LeGouguec, Helene A. 08 1900 (has links)
No description available.

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