放射治疗射野片的拍摄和分析  

Shooting and Assessing the Portfilm in Radiation Therapy

作　　者：柯祺[1] 

机构地区：[1]广东省汕头市中心医院放疗科,广东汕头515011

出　　处：《中国医药指南》2013年第7期414-415,共2页Guide of China Medicine

摘　　要：目的探讨放射治疗射野片的拍摄及误差分析。方法采用双曝光技术的方法对放射治疗射野验证片拍摄,在曝光时以十字插板为参考坐标,并根据片中标记的人体部位计算中心移位误差,与CT模拟定位DRR图进行比较分析,测量摆位误差。结果 25例患者经过拍摄后一共得到50张验证片。两种拍摄的射野片的图像都比较清晰的显示了目的区域的形状、大小及与人体解剖标记之间的定位。统计其误差数据没有统计学差异(在x、y、z方向上,P>0.05)。结论采用双曝光技术的方法拍摄的射野片操作简便、成像较清晰、在临床上可以有效的减少摆位误差。Objective To evaluate the value of megavolt computed radiography techniques for portal field verification in radiation oncology department. Methods Double-exposure technique was used to take the portal images. The reference mark points were added to the field at the first exposure and the cross lines drawn based on the images were defined as the reference coordinate to the actual field. Results 50 images of 25 patients were taken before radiotherapy. The CR images and simulator images can display the field shape, size, treatment center and anatomy structure clearly. All different structures and positions could be identified in order to assess if the actual field coincided with the radiation planning. Two groups of the result is negative （P〉 0.05 in x, y and z axis）. Conclusion It was satisfactory using CR technique for the radiotherapies patient＇s portal field image. The technique for patient position verification was effective.

关 键 词：照射野 摄像验证 质量控制 

分 类 号：R815[医药卫生—放射医学]