一、引言放射治疗的原则是在消灭肿瘤的同时,保护正常组织、并尽量减少全身的积分剂量。楔形板是放在线束内的楔形吸收板,它使等剂量曲线达到所需要的不对称形态(图1)。楔形板的合理布局可在接受治疗的肿瘤区域内获得均匀的剂量分布,适用于偏于一侧的肿瘤。对于较深部位的肿瘤可用二个楔形野来代替多野的交叉照射,以减少全身的积分剂量。图2) I. INTRODUCTION The principle of radiation therapy is to protect normal tissues and minimize the integral dose of the body while eradicating tumors. The wedge plate is a wedge-shaped absorption plate placed inside the bundle, which brings the isodose curve to the desired asymmetrical shape (Figure 1). The rational layout of the wedge plate provides a uniform dose distribution within the treated tumor area and is suitable for tumors on one side. For deeper tumors, two wedge fields can be used instead of multi-field cross irradiation to reduce the systemic integrated dose. figure 2)