前额辅助标记点在脑瘤放疗中的应用  被引量:3

Application of forehead dot marking in radiotherapy for brain tumors

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作  者:张丽华[1] 白飞[1] 李捷[1] 许林[1] 刘晓莉[1] 石梅[1] 

机构地区:[1]第四军医大学附属西京医院放疗科,西安710032

出  处:《中华放射肿瘤学杂志》2016年第4期385-387,共3页Chinese Journal of Radiation Oncology

摘  要:目的:探讨前额辅助标记点在脑瘤放疗体位固定中的意义。方法对2013—2014年间84例脑瘤患者行头部热塑模网罩体位固定,其中36例加以中心型前额辅助标记点( A组),分别与27例常规固定技术( B组)、21例加以偏心型前额辅助标记点( C组)采用千伏级CBCT进行空间位置偏差比较。最后将A组第1次偏差结果分别与之后的误差进行t检验比较。结果 A组CBCT 212次、B组CBCT 158次的通过率分别为95.2%、93.8%。 A组与B组在x、y、z轴上的误差分别为(0.868±0.618) mm与(1.319±0.935) mm (P=0.005)、(1.118±0.692) mm与(1.149±0.807) mm (P=0.824)、(0.868±0.790) mm与(0.936±0.919) mm (P=0.665)。 C组在x轴方向上的误差为(1.162±0.866) mm,分别与A组、B组相近( P=0.070、0.430)。 A组x轴首次误差与第6次误差不同[0.790±0.656)、(1.280±0.724) mm,P=0.030]。结论中心型前额辅助标记点较常规技术x轴的摆位精度提高,旋转误差减少,可为放脑肿瘤放疗体位固定提供新方法。Objective To investigate the role of forehead dot marking in immobilization during radiotherapy for brain tumors.Methods A total of 84 patients with brain tumors were immobilized using the full-head mask from 2013 to 2014;among these patients, 36 received dot marking at the center of the forehead ( group A) , 27 received routine immobilization ( group B) , and 21 received dot marking at one side of the forehead ( group C) .Kilovoltage cone-beam computed tomography ( CBCT) was used to compare the deviation in spatial position.The t-test was used to compare the deviation of the first CBCT in group A with the errors of subsequent CBCT.Results The passing rates of 212 times of CBCT in group A and 158 times of CBCT in group B were 95.2%and 93.8%.The errors in x, y, and z directions in groups A and B were 0.868±0.618 mm vs.1.319±0.935 mm (P=0.005), 1.118±0.692 mm vs.1.149±0.807 mm (P=0.824) , and 0.868±0.790 mm vs.0.936±0.919 mm ( P=0.665) .In group C, the error in the x direction was 1.162±0.866 mm, similar to those in groups A and B ( P=0.070 and 0.430) .In group A, the error in the x direction showed a difference between the first time and the sixth time (0.790±0.656 mm vs.1.280± 0.724 mm, P=0.030) .Conclusions Compared with the routine technique, dot marking at the center of the forehead can improve the accuracy of positioning in the x direction and reduce rotation error, and provides a new method for immobilization in radiotherapy for brain tumors.

关 键 词:脑肿瘤/放射疗法 辅助标记点 摆位误差 

分 类 号:R739.41[医药卫生—肿瘤] R730.55[医药卫生—临床医学]

 

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