子或重离子 Bragg峰特性提供了放射剂量在三维空间准确定位的可能。由于能够形成侧面和末端形状均匀的场 ,所以质子放疗成为实现高保角放疗的准确和可行的方法。用模拟法对量子进行强度调制时 ,可以许多独立非均匀场用质子来建立剂量分布 ,而用 Bragg峰剂量定位使每个场在二维 The sub-or Bragg peak properties of heavy ions provide the possibility of accurately locating the radiation dose in three-dimensional space. Due to the ability to form fields with uniform lateral and distal shapes, proton radiation therapy is an accurate and feasible method of high-angle radiotherapy. When modeling quantum intensity modulations, the dose distribution can be established with many independent, non-uniform fields using protons, whereas the Bragg peak dose positioning allows each field to be resolved in two dimensions