Methods With the same acoustic power and exposure deep, long-time HIFU exposure and short-time fractional HIFU exposure were applied to ablate bovine liver tissue in vitro at total exposure time 1 s, 3 s and 5 s respectively.

• 方法固定声功率及辐照深度,总辐照时间分别为1、3、5s,采用长时单次辐照与短时多次辐照2种模式损伤离体牛肝,从靶点温升、超声灰度及病理改变等几方面进行比较。