Implementation of multiple-channel transmit/receive focused ultrasound therapy system

• Main Authors: Hao Yu Jhong, 鍾皓宇
• Other Authors: H. L. Liu
• Format: Others
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/41755833526755316246

碩士 === 長庚大學 === 電機工程學系 === 98 === Ultrasound phased-array system has the capability to steer the energy through the bone so that transcranial/ transrib therapy is feasible. However, ultrasonic energy when passing through the bone can be distorted significantly to fail the focal beam steering, and also cause intervening bone heating. A possible solution is to receive echo-signals from each transmit elements for further correction or dynamically activate/deactivate elements for restoring the focus and preventing from temperature buildup in bone. The purpose of this study is to develop the hardware of a 256-channel ultrasound transmit/receive system in order to achieve transcranial/ transrib therapy. The system comprises of PC/MCU/FPGA duplex communication and triggering so that transmit/ receive sequence of each channel can be well controlled. Echo signals received from each element and amplified through a channel-multiplexing circuit. When combining high-speed A/D conversion and USB data transmission, echo signals can be real-time feed into PC for real-time process. We also successfully demonstrated the designed system can be successfully applied to activate/ deactivate phased array elements, which provides potential for transcranial/ transrib ultrasound therapy.