Objective: to compare the effect of different contrast-enhanced protocols and choose the optimal contrast material injection protocols for hepatic conventional ct and helical ct.
目的：比较不同注射程序对肝脏增强效果的影响，探寻常规ct及螺旋CT肝脏增强检查的最佳造影剂注射程序。
The feeding method using intermeshing helical roll has advantages over that using the conventional roll in working capacity, feeding stability and unit energy cost.
实验结果表明，在生产能力、喂料稳定性和能量单耗方面，螺旋啮合辊喂料方法优于传统的旁压辊喂料方法。
Using conventional coupled-mode theory, a set of coupled-mode equations are formulated for single-helix chiral fiber long-period gratings. A helical-core fiber is analyzed as an example.
采用传统的耦合模理论，建立了单螺旋手征长周期光纤光栅的耦合模方程，并以螺旋芯光纤为例进行了理论分析。
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