Beams of X of gamma rays in three dimensional (3D) conformal radiotherapy is one of very accurate treatment techniques, and also the important physical methods increased treatment ratio.
射线三维定向放射治疗作为一种精度很高的治疗技术，是提高治疗比的重要物理措施。
Objective To study the feasibility of mean target in three dimensional conformal radiotherapy (3d CRT) for small lesion of lung carcinoma.
目的探讨靶区中心的平均位置应用于肺部小肿瘤三维适形放射治疗的可行性。
OBJECTIVE:To evaluate the clinical value of hyperfractionated external irradiation followed by 3D conformal radiation therapy boost to recurrent NPC after primary radiotherapy.
目的：初步评价超分割外照射加立体定向适形放射剂量治疗局部复发鼻咽癌的临床疗效及毒副反应。
OBJECTIVE:To evaluate the clinical value of hyperfractionated external irradiation followed by 3D conformal radiation therapy boost to recurrent NPC after primary radiotherapy.
目的：初步评价超分割外照射加立体定向适形放射剂量治疗局部复发鼻咽癌的临床疗效及毒副反应。
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