Date of Graduation
Statler College of Engineering and Mineral Resources
Lane Department of Computer Science and Electrical Engineering
Cardiac output is the amount of blood pumped by the heart in one minute. The Doppler effect can be used to measure cardiac output by measuring the peak frequency, which is directly proportional to the velocity of blood flowing in the aorta, associated with the Doppler shift signal when an ultrasound beam is incident on the aorta. Stroke volume is the product of the cross sectional area of the aorta and the integration of peak velocity over time. Stroke volume times the heart rate is the cardiac output. This project attempts to develop an algorithm that would automatically calculates the peak frequency from the shift signal and derive the cardiac output. The difference in the power levels in the FFT of the signal in the presence and absence of blood flow is the major discriminating factor used in the peak frequency detection. Eventually, this algorithm will be used to analyze data for understanding the mechanism for a cardiovascular abnormality called the orthostatic intolerance, which is found in astronauts returning from space as well as people on earth.
Diggikar, Amit, "Development of a method for calculation of cardiac output using Doppler ultrasound" (1999). Graduate Theses, Dissertations, and Problem Reports. 986.