尽管如此，治疗时间不可避免地延长了：当更换时放射外科治疗必须中止，配置各个准直器的直线加速器必须围绕患者运动。
However, treatment will inevitably take longer: radiosurgery is paused whilst the exchange is performed and the linac must be moved around the patient with each collimator fitted.
根据运动矢量场自适应选择搜索起始点和不同的搜索策略进行搜索，同时设定阈值对静止块直接中止搜索。
Then the initial search point and 2 search strategies were adaptively chosen according to the motion vector field, and an threshold was also selected to detect stationary blocks.
算法结合误差曲面特性以及运动矢量中心偏移特性，得到最佳参考运动矢量；利用运动矢量的方向和强度信息，确定搜索方向，切换搜索模式，搜索的同时应用全零块的中止准则。
It gets the best reference motion vectors from the error - surface and the center deviation characteristics, and it USES the direction and intensity information to choose the proper searching mode.
算法结合误差曲面特性以及运动矢量中心偏移特性，得到最佳参考运动矢量；利用运动矢量的方向和强度信息，确定搜索方向，切换搜索模式，搜索的同时应用全零块的中止准则。
It gets the best reference motion vectors from the error - surface and the center deviation characteristics, and it USES the direction and intensity information to choose the proper searching mode.
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