摘要
目的探讨图像引导放射治疗（IGRT）技术在校正胸腹部恶性肿瘤大分割放疗时的误差及价值。方法对31例经病理诊断明确为胸腹部恶性肿瘤患者行大分割放疗。分次照射剂量为3～12 Gy,总剂量为30～54 Gy,其中分次剂量3 Gy为3例,5 Gy为8例,6 Gy为9例,8 Gy为7例,12 Gy为4例。每次治疗前行锥型束CT,在线校正摆位误差并记录误差值。结果校正后均数标准差在左右（X）、头脚（Y）和腹背（Z）方向上分别为（2.02±2.18）mm、（2.26±2.28）mm和（2.02±2.13）mm。结论应用IGRT技术在线校位能有效减小摆位误差,对及时发现肿瘤靶区变化情况和适时调整临床放射治疗方案有重要意义。
Objective The radiation positioning error and clinical value of IGRT in modifying hypofractionated radiotherapy for thoracic and abdominal tumors were discussed. Methods Thirty-one cases of patients who received image-guide hypofractionated radiotherapy for thoracic and abdominal tumors were included in this study. Fractionated irradiation dose was 3 to 8 Gy, total dose was 30 to 54 Gy, and there were fractionated dose of 3 Gy 3 cases, 5 Gy 8 cases, 6 Gy 9 cases, 8 Gy 7 cases and 12 Gy 4 cases. Each treatment forward Cone-beam CT and online correction setup errors and record the error value. Results After online correction, standard deviation of the mean in R-L（X）, S-I（Y）, and A-P（Z） directions were（2.02±2.18） mm,（2.26±2.28） mm and（2.02±2.13） mm. Conclusion The positioning error was decreased effectively after the correction in IGRT, it is the significance to find the changes of gross tumor volume timely and adjust the clinical treatment of radiation correctly.
出处
《医疗装备》
2016年第7期130-131,共2页
Medical Equipment
关键词
图像引导放射治疗
胸腹部肿瘤
大分割放疗
锥型束CT
摆位误差
在线校位
Image-guide radiation therapy
Thoracic and abdominal tumors
Hypofractionated Radiotherapy
Cone-beam CT
Setup error
Online correction
