Abstract

Info

Author(s):: ZHANG Haoqiang; AN Mengmeng; BU Zhaohui; ZHENG Zheng; School of Medical Instrument and Food Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China

Keywords:: Keywords: pulse wave ultrasonic echo signal ultrasonic sensor photoplethysmography wavelet denoising

Abstract:: Abstract: The pulse wave can be used as an important basis for detecting the physiological and pathological states of the human cardiovascular system. In order to verify the possibility of detecting pulse waves with ultrasound and to solve the problem of restricted sites for pulse wave detection, a method of extracting pulse waves from ultrasonic echo signal is proposed. A following ultrasonic sensor was designed, and a data acquisition system was used to collect the ultrasonic echo signals at the fingertips. Pure pulse wave signals were obtained after filtering, point selection and wavelet denoising. Meanwhile, the electrocardiogram signals and the photoplethysmography signals were collected as reference signals. The results show that the heart rate can be accurately obtained from the extracted fingertip pulse wave, and that the correlation coefficient between the pulse wave signals and the photoplethysmography data measured at the same time is mainly above 0.8. Such details as dicrotic wave and dicrotic wavefront can also be displayed clearly. By the proposed method, a complete and reliable pulse wave signal can be obtained from the ultrasonic echo signals at the fingertips, which lays significant foundations for obtaining pulse signals from different sites in the future.