评审代码行的数量超过200时，缺陷密度就会急剧地下降。

As the number of lines of code under review grows beyond 200, defect density drops off considerably.

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方法：9例志愿者行主动脉弓同层动态增强扫描，利用获得的主动脉弓时间-密度曲线（TDC），寻求触发技术的理论阈值。

Methods:Dynamic CT scan was performed in 9 volunteers, measuring the CT value of the same plane of aortic arch and the theoretical threshold was obtained by the time density curve(TDC).

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全部病例均行上中腹部CT平扫及全腹部增强扫描，观察淋巴结的大小、形态、密度、强化方式及增大淋巴结的优势分布。

All the cases had plain CT of upper and middle abdomen and enhanced CT of abdomen, and to observe the size, shape, density, enhancement and distribution of lymph nodes.

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