Design of a Portable Very-High-Frequency Ultrasound Biomicroscope

Objective To develop a portable very-high-frequency ultrasound biomicroscope. Methods This system is primarily an ultrasonic transducer, ultrasonic transmission and receiving modules, imaging software on a host computer and peripheral equipment. A PVDF transducer with a frequency between 20 and 50 MHz was used for the ultrasonic transducer. In the transmission and receiving modules, the radio frequency echo signals were digitized by high-speed A/D. Then, the digital signals were transmitted, added, filtered, demodulated, log-amplified, double-sampled, and transferred to the host computer by USB interface for real-time display. Results The system was tested with a resolution test and an imaging experiment using a normal human eye, and improved experimental results and real-time images were obtained. Conclusions The system enabled real-time imaging using portable VHF ultrasound biomicroscope. The scheme was concise and clear. The overall design of the system was simple, and the overall performance and portability of the system were improved.