从这里开始，可能需要修改扫描频率(PowerStrip工具可以修改这个设置)，直到获得稳定的图像为止。

From there, you may need to adjust the scan rate (a setting that the PowerStrip tool allows you to modify) until you get a stable picture.

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目的：研究立体定向放射治疗肺癌中呼吸运动频率与图像扫描时间对靶体积定位成像结果的影响。

Objective: to study the effects of respiratory movement frequency and scanning time on the image results in the treatment of lung cancer by stereotactic radiotherapy.

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扫描采样率对成像质量至关重要，可通过驱动信号的频率选择和图像采集时间的设定来控制。

The scanning sampling density crucial to imaging quality can be deliberately controlled by setting of the driving frequencies as well as fetching duration.

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