信号斑

T1WI：4例呈低信号伴斑片状高信号，1例为低信号，用脂肪抑制后T1WI高信号3例完全消失，1例大部分消失伴多囊状改变；

One mass was low signal intensity and four masses were heterogeneously with high signal intensity on T1WI , which disappeared completely in three cases after using fat satura - tion , and in one case most part of the high signal disappeared and also with multiple cystic change detected .

通过采样束的相位和振幅扰动可以定义信号载体散斑和信号降低散斑。

The concepts of signal carrying and signal degrading speckle are defined in terms of the phase and amplitude disturbances of the sample beam .

此外，还总结了在不同驱动频率、不同驱动电压、不同的驱动信号加载方式、以及不同类型的周期驱动信号下斑图形成的规律。

In addition , we also summarized the formation of LC patterns in different driving conditions , such as different amplitude , different frequency , changing driving signal as well as different kinds of periodic driving .