利用千伏级锥形束计算机断层扫描分析头颈部肿瘤放疗中两种不同头枕固定方式的摆位误差  

Analysis of setup errors of two different headrest fixation methods in radiotherapy for head and neck tumors by using kilovoltage cone-beam computed tomography

作　　者：谢有海 钟长游 杨和忠 蒋振东[1] Xie Youhai;Zhong Changyou;Yang Hezhong;Jiang Zhendong(Radiotherapy Room,Meizhou People's Hospital of Guangdong Province,Meizhou 514021,China)

机构地区：[1]广东省梅州市人民医院放射治疗室,514021

出　　处：《肿瘤研究与临床》2020年第7期498-501,共4页Cancer Research and Clinic

摘　　要：目的探讨头颈部肿瘤患者放疗时采用透明头枕和真空袋头枕两种固定方式的摆位误差。方法选择2017年1月至2018年12月广东省梅州市人民医院收治的头颈部肿瘤放疗患者40例,采用随机数字表法分为对照组(透明头枕固定)与研究组(真空袋头枕固定),每组20例。在直线加速器治疗过程中,利用千伏级锥形束计算机断层扫描(CBCT)获取每例患者10次的配准图像数据。分析两组线性摆位误差和旋转摆位误差。结果研究组患者头脚(Y轴)方向、左右(X轴)方向、前后(Z轴)方向线性摆位误差分别为(1.1±0.8)mm、(0.9±0.8)mm、(1.2±0.9)mm,对照组分别为(1.3±1.1)mm、(1.1±1.1)mm、(1.4±1.1)mm,研究组X轴、Y轴、Z轴旋转摆位误差分别为(0.73±0.52)°、(1.08±0.89)°、(0.89±0.74)°,对照组分别为(0.81±0.69)°、(1.38±1.05)°、(0.88±0.70)°。两组Y轴和Z轴线性摆位误差差异有统计学意义(P=0.016,P=0.004);两组X轴、Y轴旋转摆位误差差异有统计学意义(P=0.036,P=0.001)。结论头颈部肿瘤患者放疗时真空垫头枕在改善旋转摆位误差和线性摆位误差方面都较透明头枕好。Objective To investigate setup errors of two fixation methods of transparent head pillow and vacuum bag head pillow in patients with head and neck tumors when undergoing radiotherapy.Methods A total of 40 patients with head and neck tumors undergoing radiotherapy admitted to Meizhou People's Hospital of Guangdong Province from January 2017 to December 2018 were selected and randomly divided into the control group(transparent head pillow fixation)and the research group(vacuum bag head pillow fixation),with 20 cases in each group.Kilovoltage cone-beam computed tomography(CBCT)was used to obtain the registration image data of each patient for 10 times during the linear accelerator treatment.The linear and rotational positioning errors of two groups were also analyzed.Results The linear setup errors in the direction of left-right(X-axis),head-foot(Y-axis)and front-back(Z-axis)were(1.1±0.8)mm,(0.9±0.8)mm and(1.2±0.9)mm in the study group,and(1.3±1.1)mm,(1.1±1.1)mm and(1.4±1.1)mm in the control group.The rotation setup error of X-axis,Y-axis,Z-axis was(0.73±0.52)°,(1.08±0.89)°and(0.89±0.74)°,respectively in the study group,and(0.81±0.69)°,(1.38±1.05)°,(0.88±0.70)°,respectively in the control group.The difference of linear setup error in Y-axis and Z-axis was statistically significant(P=0.016,P=0.004).The difference of rotation setup error in X-axis and Y-axis was statistically significant(P=0.036,P=0.001).Conclusion The vacuum pillow is better than the transparent pillow in improving the rotation error and linear error for patients with head and neck tumors undergoing radiotherapy.

关 键 词：头颈部肿瘤 放射疗法 锥束计算机体层摄影术 摆位误差 线性误差 旋转误差 

分 类 号：R730.55[医药卫生—肿瘤] R739.91[医药卫生—临床医学]