报告人：Jiyan Dai

单位：The Hong Kong Polytechnic University

报告时间：2025年7月28日星期一 10:00

报告地点：知新楼C1111

邀请人：王春明

Abstract:

In recent years, there have been rapid developments in medical ultrasound, for example, flexible ultrasound transducers for wearable ultrasound imaging, in vivo 3D ultrasound imaging with 2D-array transducers, photoacoustic imaging and ultrasound histotripsy for cancer treatment etc. Our group in the Hong Kong Polytechnic University has been devoting in medical ultrasound transducers development in the last 20 years and are recently developing row-column-addressed (RCA) transducers for in vivo 3D imaging of brain and heart blood flow, transparent ultrasound transducers for photoacoustic imaging, as well as high-power ultrasound transducer for cancer treatment.

Three-dimensional ultrasound imaging is of great importance for both clinical application and biomedical research, but it’s complicated in fabrication and very expensive in hardware due to requirement of thousands of electronic channels. We have successfully developed row-column-addressed (RCA) transducers which are suitable for observing blood flow in brain and heart. The transducers have 128x128 elements which can be driven by 256 independent channels and the frequencies are in the range of 2-20 MHz; and the optimized performance of -6 dB average bandwidth of ~80% are achieved. With these transducers, 3D images of mouse brains have been acquired, demonstrating the potential application of our developed high-frequency RCA transducer for biomedical research and clinical applications.

Photoacoustic imaging (PAI) technique has been employed as a powerful tool for experimental and clinical applications; however, conventional ultrasound transducers block the light path, leading to bulky and inefficient PAI system designs. We have developed transparent ultrasound transducers, allowing light transmission through transducers and illuminating target directly. Our developed transparent transducer from linear array to 2D array will be used for photoacoustic imaging.

Biography:

Dai Jiyan is an internationally renowned scholar in the research on the structure of functional thin film materials and devices such as high-frequency and broadband ultrasonic transducers used in medical imaging. He has published more than 300 papers, which have been cited by more than 15,000 times (H index 57). He has published a monograph book "Ferroic Materials for Smart Systems-from Fundamentals to Device Application" (2020 Wiley).  He has completed a number of science and technology projects funded by the Hong Kong government and National 973 Project "Development of Advanced Ultrasonic Probes". He won the first prize of Guangdong Natural Science in 2020. He is currently a committee member of the National Medical Equipment Society, National Dielectric Physics Society and the National Micro-Nano Technology Society of China.

戴吉岩，香港理工大学应用物理系教授、博士生导师。1988年毕业于复旦大学物理系，1991年获清华大学硕士学位，1994年于中国科学院获博士学位，之后分别在美国西北大学，新加坡材料与工程研究所任博士后研究员。2001年任职香港理工大学，2013年获聘教授。主要从事医用超声和功能材料与器件研究。已经发表国际学术期刊300余篇，获授权专利10余项。著有专著 “Ferroic Materials for Smart Systems - from Fundamentals to Applications” (Wiley, ISBN: 978-3-527-34476-5 February 2020). 先后主持各级科研项目多项，包括国家973项目（先进声学材料与超声探头的研究），深圳科创委项目，香港自然科学基金和创新科技项目。获得2020年广东省自然科学一等奖。亚洲铁电协会主席，全国电介质物理学会理事等等。2024年入选教育部长江讲习教授计划。