A better define of the tumor target to keep the target in planning beams and keep the prescriptive dose to defined treating areas is needed.

• 图像引导放射治疗在肺癌的精确定位、计划制定、照射实施及计划校正等放疗的各个环节中都发挥重要作用,是达到肺癌精确放疗的重要手段。