Ct usually demonstrates a high attenuation region surrounded by a halo of abnormally low attenuation, consistent with acute hemorrhage and secondary edema, respectively.

CT上经常显示一个高信号衰减区外周围绕一圈低信号衰减光晕，这种影像与相应的出血和继发性水肿是相一致的。

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Assuming a trilinear geometrical spreading model, we obtained the attenuation function in Guangdong region.

采用三段几何衰减模型拟合，得到了广东地区的几何衰减函数。

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Objective the variations of the site and shape of focal region for a concave spherical ultrasound transducer in the case of high sound intensity and stronger attenuation were studied.

目的研究凹球面超声换能器的声焦域在高声强和媒质有较大衰减情况下，其形状和几何位置的变化。

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