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自20世纪90年代以来,随着计算机技术和高新技术的发展,肿瘤的放射治疗模式发生了巨大的改变。传统的二维治疗模式逐渐被三维适形放疗(3-dimension comformal radioation therapy,3D-CRT)模式所取代。新近发展起来的调强放疗(intensity modulated radiation therapy,IMRT)是3D-CRT的一种更高层次的放射治疗方式。IMRT的出现被肿瘤放射治疗学家喻为是继深部X线治疗机和加速器应用以来的第三次飞跃,同时被认为是21世纪肿瘤放射治疗的发展方向。目前,3D-CRT在世界范围内已成为常规的放射治疗技术,由于IMRT的出现仅有数年时间,但在世界范
Since the 1990s, with the development of computer technology and high technology, there has been a dramatic change in the radiation therapy model of tumors. The traditional two-dimensional treatment model is gradually replaced by 3-dimensional conformal radiation therapy (3D-CRT) mode. The newly developed intensity modulated radiation therapy (IMRT) is a higher level of radiation therapy for 3D-CRT. The emergence of IMRT is regarded by tumor radiologists as the third leap in the application of deep X-ray machines and accelerators and is considered as the development direction of 21st century radiation therapy. At present, 3D-CRT has become a routine radiotherapy technique in the world. Since the appearance of IMRT is only a few years,