尽管现在麻醉和抗菌素的发展允许扩大手术范围提高根治效果,但是术后显微镜下恶性肿瘤留下来的可能性却经常存在。况且,大血管周围的癌巢用手术的方法来完全消灭是困难的。另一方面,体外放射杀灭癌细胞也受到剂量限制。为了克服这些手术和放射的限制,开展了术中放射治疗。术中放射技术术中放射适合用电子束,因为它的深度剂量有一个高峰区,并且衰减很快,这 Although the development of anesthesia and antibiotics now allows the expansion of the range of surgery to increase the effectiveness of radical treatment, the possibility of residual malignant tumors under the microscope is often present. Moreover, it is difficult to completely eliminate the cancerous nests around the large blood vessels by surgical methods. On the other hand, radiation killing cancer cells in vitro is also dose-limited. In order to overcome these limitations of surgery and radiation, intraoperative radiation therapy was carried out. The intraoperative radiological technique is suitable for the use of electron beam radiation because its depth dose has a peak area and decays rapidly.