Date of Award
Spring 1989
Document Type
Thesis - Restricted
Degree Name
Master of Science (MS)
Department
Biomedical Engineering
First Advisor
Battocletti, Joseph H.
Second Advisor
Ackmann, James J.
Third Advisor
Jeutter, Dean C.
Abstract
Physiological signals are often buried in noise. In order to improve the signal-to-noise ratio, the signals are averaged. Signals obtained from the following devices are averaged in this thesis: photo-electric plethysmograph, doppler flowmeter, NMR blood flowmeter, electrocardiograph, and a pump system simulating blood flow on the extracorporeal electromagnetic flowmeter. Since these signals depend on the heart rate and the heart rate of a healthy individual varies even at rest, the signal averaged waveform becomes dispersed. Dispersion in this thesis refers to the broadening of the averaged waveform due to a variable heart rate. Dispersion of the above signals is illustrated and discussed in this thesis. A model of the phenomenon of dispersion of the NMR blood flow pulse is developed using a triphasic flow pulse. Finally, the signal-to-noise improvement is evaluated for the model signal.
Recommended Citation
Adamson, Nancy Mae, "Dispersion of Signal Averaged Pulsatile Blood Flow Waveforms Due to a Variable Heart Rate" (1989). Master's Theses (1922-2009) Access restricted to Marquette Campus. 3867.
https://epublications.marquette.edu/theses/3867