supported by the National Natural Science Foundation of China (Grant Nos.10974098 and 10774071);the Natural Science Foundation of Jiangsu Province,China (Grant No.BK2009407);the Doctoral Foundation of Ministry of Education of China (Grant No.20093207120003);the National Basic Research Program of China (Grant No.2010CB732600)
The difference-frequency (DF) ultrasound generated by using parametric effect promises to improve detection depth owing to its low attenuation, which is beneficial for deep tissue imaging. With ultrasound contrast a...