放射治疗中常常需要采用不规则的照射野进行照射。目前所用的高能放射治疗设备由于光栏设计的限制,只能采用规则的照射野,绝大部分为方形或矩形,虽然有备用的屏蔽钨块稍能改变照射野的形状,但不能完全符合病灶区域的要求,每易导致治疗失败。不规则大面积复合野照射方法可以避免上述缺点。 Irradiation often requires the use of irregular radiation fields. Currently used high-energy radiation therapy equipment can only use regular radiation fields because of the limitation of the design of the optical field. Most of them are square or rectangular. Although there are spare shielded tungsten blocks that can slightly change the shape of the radiation field, they cannot fully meet the lesions. The requirements of the area, each lead to treatment failure. Irregular large-area complex field irradiation methods can avoid the above disadvantages.