CT的介入,使肺癌的胸膜、胸壁浸润程度、肺门及纵隔的淋巴结转移有可能作出正确的诊断;也可使肺癌放疗的靶体积更正确;使肿痛及其周围器官,如脊髓、心脏等剂量分布正确合理;并可作 The involvement of CT can make lung cancer pleural and chest wall infiltration extent, lymph nodes metastasis of the hilar and mediastinal may make a correct diagnosis; but also can make the target volume of lung cancer radiotherapy more correct; so that swelling and its surrounding organs, such as the spinal cord, heart Equal dose distribution is correct and reasonable;