More injection flow rate, slim branch injection pipe and long pipeline resulted in more resistance at the branch injection pipe.

由于注水量较高、注水支线管径较细、管线较长等原因，导致注水支线阻力偏大；

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Piston-cylinder is the fuel measurement unit of the injection flow meter and plays a crucial role in the system measurement accuracy.

活塞测量缸作为测量仪的油量测量单元，其结构设计好坏直接影响到系统的测量精度。

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Conclusion Multi-slice spiral ct can provide quantitative analysis to renal blood perfusion, but injection flow rate influence the perfusion parameters.

结论多层螺旋CT可对肾脏组织血流灌注进行定量分析，但注射流率影响灌注数值。

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