A Digital Multigate Doppler Method for HighFrequency Ultrasound

Sensors

Yanyan Yu¹  Lei Sun²  Congzhi Wang³  Weibao Qiu³  Yang Xiao³  Peitian Mu³  Liyang Chi³  Guofeng Li³  Zongying Ye³  Hairong Zheng³  Yan Chen⁴  Jiyan Dai⁴ 

[1] Department of Electronic Engineering, City University of Hong Kong, Hong Kong, China;Interdisciplinary Division of Biomedical Engineering, The Hong Kong Polytechnic University, Hong Kong, China;Paul C. Lauterbur Research Center for Biomedical Imaging, Institute of Biomedical and Health Engineering, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China;The Hong Kong Polytechnic University Shenzhen Research Institute, Shenzhen 518057, China;

关键词: flow visualization;    multigate PW Doppler;    digital quadrature demodulation;    high frequency ultrasound;   

DOI  :  10.3390/s140813348

来源: DOAJ

【 摘 要 】

Noninvasive visualization of blood flow with high frequency Doppler ultrasound has been extensively used to assess the morphology and hemodynamics of the microcirculation. A completely digital implementation of multigate pulsed-wave (PW) Doppler method was proposed in this paper for high frequency ultrasound applications. Analog mixer was eliminated by a digital demodulator and the same data acquisition path was shared with traditional B-mode imaging which made the design compact and flexible. Hilbert transform based quadrature demodulation scheme was employed to achieve the multigate Doppler acquisition. A programmable high frequency ultrasound platform was also proposed to facilitate the multigate flow visualization. Experimental results showed good performance of the proposed method. Parabolic velocity gradient inside the vessel and velocity profile with different time slots were acquired to demonstrate the functionality of the multigate Doppler. Slow wall motion was also recorded by the proposed method.

【 授权许可】

Unknown