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三维适形放疗计划系统需要根据射束的不同类型和方向,在照射位置和区域上覆盖目标(肿瘤)区域的同时避免周围正常组织的过量照射,确保照射精度.发展了一种射束建模方法:1通过推导坐标系转换矩阵,将病人影像坐标系统下的三维病人模型转换到射束坐标系下;2计算照射目标中心点坐标并以此确定照射距离和射束源位置;3根据照射目标在等中心平面上的投影确定照射区域大小.应用该方法,实现了具有三维可视效果和友好交互性的射束模块.采用美国医学物理协会55号报告(AAPM 55)中基准测例和临床病人影像数据,与某商业适形放疗计划系统的射束模块进行测试比较,验证了本方法的有效性和正确性.
The three-dimensional conformal radiotherapy planning system needs to cover the target (tumor) area at the irradiation site and the area while avoiding excessive irradiation of surrounding normal tissues to ensure the irradiation accuracy according to the different types and directions of the beams. A beam modeling Methods: 1 The three-dimensional patient model under the patient’s imaging coordinate system was transformed into the beam coordinate system by deriving the transformation matrix of the coordinate system; 2 Calculating the coordinates of the center of the irradiation target to determine the irradiation distance and the position of the beam source; 3 According to the irradiation The projection of the target on the isocenter plane determines the size of the irradiation area.Through this method, a three-dimensional visual effect and friendly interactivity beam module is achieved.According to the benchmarking in the American Medical Physics Association Report 55 (AAPM 55) and The clinical patient imaging data is compared with the beam module of a commercial conformal radiotherapy planning system to verify the validity and correctness of the method.