自适应放射治疗靶区运动补偿系统的设计

Design of an adaptive radiation therapy system for target movement compensation

为了进一步减小肿瘤放射治疗中靶区运动造成的误差,设计了一套自适应靶区补偿运动的系统和方案,并完成了系统设计和模拟试验。通过控制系统采集患者靶区标记点当前时间的运动位置,与参考点的位置进行比较以控制治疗床向当前时间运动方向相反的方向移动。治疗床的三维运动由控制系统控制三个独立的步进电机实现,控制电机的运动就能实现对治疗床的控制。通过模拟实验表明,本系统能减小放射治疗过程中由于呼吸等运动造成的靶区运动的误差。本系统具有实时性好、运动精度高的特点,具有较高的临床应用价值。

In order to decrease the radiotherapy error caused by target motion, an adaptive radiation therapy system for target movement compensation has been designed and passed by simulation test. The real-time position of the target labelled by a mark was captured by the control system and compared with the reference point. Then the treatment couch was controlled to move in the opposite direction for compensation according to that position information. The three dimensional movement of the treatment bed relied on three independent stepping motors which were controlled by a control system. Experiments showed that the adaptive radiation therapy system was able to reduce the therapy error caused by target movement. It would be useful in radiotherapy clinical practice with high real-time position precision.