随着放射治疗学的发展,三维适形放疗(3DCRT)在世界范围内已逐渐成为放射治疗的常规技术,它能使治疗区的形状与靶区的形状一致,从三维方向上进行剂量分布的控制,能提高局部控制率,减少正常组织的照射剂量,保证精确的体位固定技术、定位和重复摆位是实现3DCRT的根本措施[1]。本文 With the development of radiotherapy, three-dimensional conformal radiation therapy (3DCRT) has become a routine technique for radiation therapy worldwide. It enables the shape of the treatment area to be consistent with the shape of the target area, and dose distribution is performed from the three-dimensional direction. The control can increase the local control rate, reduce the radiation dose of normal tissues, and ensure the accurate position fixing technology, positioning and repeated position setting are the fundamental measures to achieve 3DCRT [1]. This article