sound shadow ; acoustic shadow
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阑尾内粪石并声影；
The indirect sign included the stercolith in the appendix with sound shadow;
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The indirect sign includes the stercolith in the appendix with sound shadow;
这两种“彩色信号”与灰阶中结石的声影相对应。
The two "color signal" correspond to the sound and the gray shadow in the stone.
超声遇到骨骼、结石、钙化等密度较大的介质时，声阻抗大，超声波完全被反射回去，其深层因无声能而呈无回声平直条状区。
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