Abstract

Info

Title:: Design of power motion-mode transcranial Doppler ultrasonic measurement system

Author(s):: LI Yiqing; XIA Ling; ZHAO Xingqun; School of Biological Science and Medical Engineering, Southeast University, Nanjing 210000, China

Keywords:: Keywords: transcranial Doppler; ultrasonic measurement; power motion-mode Doppler imaging technique; dual FIFO; short time Fourier transform

Abstract:: Abstract: Transcranial Doppler (TCD) is a common technique used for studying haemodynamics of intracranial vessels. The traditional TCD has some disadvantages, such as difficulties in positioning the blood vessels and detecting the embolus in human’s brain. To overcome these deficiencies, a power motion-mode TCD measurement system is designed by combining different modules, such as field-programmable gate array, USB chips and processed data on personal computer. The digital circuit module centred on field-programmable gate array was applied for designing the system state machine. Meanwhile, high-speed AD simultaneous sampling chip and ping-pong working mode of dual FIFO were used to assure a real-time performance. The data transmission between hardware and personal computer was realized by high-speed USB. The software module combined with power motion-mode imaging technique, short time Fourier transform and pseudo-color image processing to monitor the whole state of blood vessels in the transmitting ditrection of ultrasonic beams, which can easily locate blood vessels and provide the doctors with more information of the ultrasonic spectrum.