准确的曝光控制也非常重要，要做到这一点，摄影师依靠的是曝光直方图。
Absolute exposure control is crucial, and to get it, the photographers relied on exposure histograms.
使用CT的激发扫描功能控制曝光时间能得到更准确的肝动脉期时间。
Using ct arouse scanning function control exposure time can get more accurate liver artery issue time.
在质量控制过程中，噪声是重要的指标之一，由噪声与曝光剂量的函数关系，准确测量噪声还可以作为测量曝光剂量的方法。
The noise is one key parameter on routine quality control. Because the image noise is a function of the dose, precisely measuring the noise is also a method for measuring the dose of ct scanners.
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