Cardiac perforation with intramural deposition of contrast agent is a severe com-plication of selective angiocardiography.

心脏穿孔和壁间造影剂沉积是选择性心血管造影严重并发症之一。

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METHODS: Selective cerebral hypothermia is taken as a positive contrast.

方法：以选择性头部低温为阳性对照。

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A new type of high contrast filter has been investigated in this paper. lt has features of lower light reflection on surface, selective transmission and effective electromagnetic screen.

本文介绍自行研制的高对比度滤光片。它具有较低的表面光反射率、选择性透过率和电磁屏蔽特性。

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