容积弧形调强治疗在食管癌中的应用

Application of volumetric modulated arc therapy in esophageal cancer

食管癌是我国常见的消化系统肿瘤，其发病率及病死率均较高。容积弧形调强治疗（VMAT）作为一种新型放疗技术越来越多地应用于食管癌的治疗中。VMAT可以通过降低危及器官照射剂量，保护危及器官，减少放疗不良反应；针对不同部位及不同瘤体体积的食管癌患者，VMAT可以减少治疗时间，提高靶区适形性，从而提高治疗的安全性及有效率；术前行VMAT联合化疗，增加了肿瘤降期概率，进而提高手术成功率。另有研究表明增加VMAT计划弧数可提高肿瘤靶区精确度，减少治疗时间。VMAT已成为食管癌患者治疗的一种重要方式。

Esophageal cancer is a common gastrointestinal tumor in China with high morbidity and mortality. As a new radiotherapy technique, volumetric modulated arc therapy （VMAT） is increasingly used for the treatment of esophageal cancer. VMAT can reduce the dose of endanger organs, protect the organs and re- duce the side effects of radiotherapy. For esophageal cancer patients with different location and volume, VMAT can effectively improve the safety and efficiency of treatment by reducing the treatment time and improving the conformability of the target area. Combined with chemotherapy before operation, VMAT increases the chance of tumor reduction, and improves the success rate of operation. Besides, studies have shown that increasing the number of VMAT programs can improve the accuracy of target area and reduce the time of treatment. VMAT has become an important way to treat patients with esophageal cancer.