Title :
Doppler ultrasound observation of pathological heart valves
Author :
Padmanabhan, I. ; Dhanasekaran, S. ; Ananthi, S. ; Nedumaran, D.
Author_Institution :
Central Instrum. Res. Dept., Madras Univ., India
Abstract :
A simple, noninvasive technique based on Hilbert transform (HT) time-signal displays is described. The authors discuss methods of showing forward- and reverse-flow Doppler echocardiograph signals as a time course of events relating to valve stenosis and regurgitation for providing additional cardiac insonation diagnostic information. The Doppler ultrasound demodulated signals are separated using the HT technique and then shown as segments of waveforms along with the corresponding electrocardiogram. This allows one to relate cardiac activity events, to assess valve leaflet thickness in severe mitral-valve stenosis cases, and to examine the opening and closing of valve leaflets for diagnosis
Keywords :
Doppler measurement; Hilbert transforms; acoustic signal processing; echocardiography; medical signal processing; Doppler ultrasound observation; Hilbert transform time-signal displays; additional cardiac insonation diagnostic information; cardiac activity events; events time course; forward-flow Doppler echocardiograph signals; medical diagnostic technique; pathological heart valves; regurgitation; reverse-flow Doppler echocardiograph signals; severe mitral-valve stenosis cases; valve leaflet thickness; valve leaflets closing; valve leaflets opening; valve stenosis; waveform segments; Demodulation; Electrocardiography; Filters; Frequency; Heart valves; Noninvasive treatment; Pathology; RF signals; Spectrogram; Ultrasonic imaging;
Journal_Title :
Engineering in Medicine and Biology Magazine, IEEE
