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针对呼吸引起的肺部肿瘤运动对放疗产生的影响,提出了一种肺癌放疗实时肿瘤运动补偿系统,根据在放疗前建立的呼吸状态和肿瘤位移之间的关系及在放疗过程中对病人呼吸的实时检测,间接获取肿瘤的位移量,并根据该位移量控制辅助放疗运动床运动,以调整病人的位置,从而实现对病人的肺部肿瘤运动进行补偿,减少或消除肺部肿瘤运动对放疗产生的影响.采用归一化最小均方自适应滤波器对肿瘤位移进行预测,以减少补偿滞后和系统延时所带来的影响.实验结果表明:归一化最小均方自适应滤波器对肿瘤位移具有较好的预测效果,可以满足实时肿瘤运动补偿的要求.
Aiming at the effect of respiration-induced pulmonary tumor movement on radiotherapy, a real-time tumor movement compensation system for lung cancer radiotherapy is proposed. According to the relationship between the respiratory state and tumor metastasis established before radiotherapy and the patient’s respiration during radiotherapy Real-time detection, indirect acquisition of tumor displacement, and control the amount of movement of the auxiliary radiation therapy bed to adjust the position of the patient in order to achieve the patient’s lung tumor movement compensation, reduce or eliminate lung tumor movement on radiotherapy The normalized least mean square adaptive filter is used to predict the tumor displacement to reduce the influence of compensation delay and system delay.The experimental results show that the normalized least mean square adaptive filter Displacement has a good prediction effect, to meet the real-time tumor motion compensation requirements.