它降低了X线剂量指数，提高了球管效率。

CTDI was reduced and X-ray tube efficiency is improved.

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综述了近年来在纳米结构高分子材料如纳米球、孔、管、线等方面的制备方法的研究进展，并对其应用进行了简要的讨论。

The present paper reviews the recent progresses in the preparation methods of nanostructural polymer materials , such as nanospheres , nanoporosities, nanotubes and nanowires.

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