设计了一种基于点结构光的腹部运动测量系统, 用于监测由呼吸运动引起的患者腹部实时状态, 为主动补偿放疗中因呼吸因素造成的靶区位移、实现靶区的相对静止提供精确位置信息。测量系统基于激光三角测量原理的点结构原理, 将腹部运动转换为激光点移动, 从相机记录下的图像中提取激光点位置, 根据已知系统参数即可从激光点的移动量计算得到每个时刻呼吸所引起的腹部运动量。实验表明, 所提方法能准确、实时地获取位置信息, 具有结构简单、精度高等优点, 能为胸腹动态放疗中患者呼吸因素的补偿提供一种新的解决方法。

An abdominal motion measurement system, which is based on point structured light, is designed to monitor the real-time movement of the patients’ abdomen along with respiratory motion. It can actively compensate the target displacement caused by respiratory and realize the relative stillness of the target in radiotherapy. The laser-point-structured measurement method, which is based on laser triangulation, can convert the abdominal movement into the translation of the laser point. Then, the abdominal movement can be calculated from the extracted pixel locations of the laser point in each captured image with the known system parameters. The experimental results show that the proposed method can obtain the position information accurately in real-time, and it has the advantages of simple structure and high precision and offers a new solution to compensate the respiratory influence in chest and abdomen radiotherapy.