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超声图象中接收到的回波信号可分为“镜面”回波与“全向”散射回波。当超声束遇到较大界面的组织时,如器官边缘、血管等,发生反射,称为“镜面”回波。如遇到大小比超声波长还小的物体时,所产生的回波为“全向”回波。“全向”回波的强度很弱,因此临床上可通过比较相邻区域的回
Echo signals received in ultrasound images can be divided into “specular” echoes and “omnidirectional” scattered echoes. When the ultrasound beam encounters a larger interface of tissue, such as the edge of the organ, blood vessels, etc., reflection occurs, known as the “mirror” echo. In the event of objects smaller than the size of the ultrasonic wave, the resulting echo is “omnidirectional” echo. “Omnidirectional” echoes are weak and therefore clinically comparable by comparing adjacent zones