Development of a Portable Ultrasound Imaging Device

• Main Authors: Po-Yang Lee, 李博揚
• Other Authors: Kuan-Jen Lin
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/56732350772629153348

碩士 === 輔仁大學 === 電機工程學系碩士班 === 102 === Cardiovascular disease has been one of the top ten causes of death of people. Prevention and diagnosis of cardiovascular disease and thus become a very important issue. In recent years, blood flow measurement by using Doppler ultrasound has become a useful tool for diagnosing cardiovascular diseases and as a physiological signal monitor. Recently, a couple of pocket-sized ultrasound scanners have been introduced for portable diagnosis. In addition, most devices use the digital integrated circuits to process the Doppler signals from flowing blood. In order to simplify these complex circuits, an implementation of a smartphone based portable ultrasound pulsed-wave Doppler flowmeter is reported in this study. A 10-MHz ultrasonic surface transducer was designed for the dynamic monitoring of blood flow velocity. The directional audio Doppler shift signals were obtained using a portable analog circuit system. Then the Doppler signals were fed directly to an Android-based smartphone for Doppler spectrogram analysis and display in real-time. In order to verify the portable device, a Couette flow phantom was used to simulate the flowing blood for in vitro verification. Finally, the arterial blood flow of a rat heart and a volunteer carotid were measured in vivo to verify the performance of the smartphone-based portable PW Doppler ultrasound device. All of the results demonstrated the potential of using a smartphone as a novel embedded system for portable medical ultrasound applications.