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.
由于对数字影像内定向时框标的识别与定位是从数字影像提取数据的关键步骤，框标中心坐标确定的准确度将直接关系到所提取数据信息的精度。
Because the reference mark automatic recognition and locating is an important step detecting data from digital image. The veracity of the focus of mark is related to the nicety of data.
所述套件可相对于定位贴片沿多个旋转取向而定向，并且可多次地与定 位贴片耦合和分开。
The set can be oriented at multiple rotational orientations with respect to the site, and can be coupled and uncoupled with the site multiple times.
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