Methods: To analyze 1185 cases CT plain scan and observe the circs of high density sign of middle cerebra artery. Some cases were examined by TCD.
方法：对1185例头颅平扫片进行分析，观察大脑中动脉高密度征出现情况，并对部分病例行经颅多普勒(TCD)检查。
High density urethane (HDU) commonly known by the brand name, sign Foam, is particularly useful for creating dimensional signage.
高密度板一般是以商标标识为人所知的，在制作立体标识时，这种材质是非常有用的。
Focuses had sign of the patch shaped low-density areas and high-density plot area scattered in them. They all had mass effect in different degree.
病灶为大片低密度影内可见散在、分布不均匀的斑点或斑片状高密度影，有程度不一的占位效应。
Focuses had sign of the patch shaped low-density areas and high-density plot area scattered in them. They all had mass effect in different degree.
病灶为大片低密度影内可见散在、分布不均匀的斑点或斑片状高密度影，有程度不一的占位效应。
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