Analysis of the setup errors and residual errors for ExacTrac X-ray image-guidance system for radiotherapy of somal tumors
10.3760/cma.j.issn.0254-5098.2019.02.003
- VernacularTitle:ExacTrac X-射线图像引导系统在体部肿瘤放疗中的摆位误差和残余误差分析
- Author:
Yanxin ZHANG
1
;
Hao FANG
;
Bing CHEN
;
Wei ZHANG
;
Shirui QIN
;
Qian WANG
;
Cheng CHEN
;
Hongju LI
;
Guishan FU
;
Jianrong DAI
Author Information
1. 国家癌症中心/国家肿瘤临床医学研究中心/中国医学科学院北京协和医学院肿瘤医院放疗科
- Keywords:
ExacTrac X-ray image-guidance system;
6 degree-of-freedom treatment couch;
Setup errors;
Residual errors
- From:
Chinese Journal of Radiological Medicine and Protection
2019;39(2):95-100
- CountryChina
- Language:Chinese
-
Abstract:
Objective To retrospectively analyze the setup error in radiotherapy of somal tumors and body metastases using the ExacTrac X-ray portal image,and to evaluate the feasibility and effectiveness of 6D setup error correction in body radiotherapy.Methods The translational and rotational setup errors were calculated by registering the bony structures on the ExacTrac X-setup images to that of the digitally reconstructed setup images,and the corresponding residual errors were calculated together.Results The translational and rotational setup errors in the x (left-right),y (superior-inferior),z (anterior-posterior) and Rx (sagittal),Ry (transverse),Rz (coronal) directions were(2.27±2.02) mm,(4.49±2.52) mm,(2.27± 1.37) mm and (1.02 ± 0.73) °,(0.67 ± 0.68) °,(0.76 ± 0.84) °,respectively.The residual translational and rotational setup errors in the x(r),y(r),z(r) and Rx(r),Ry(r),Rz(r) directions were(0.27±0.48)mm,(0.37±0.45)mm,(0.22±0.30)mm and (0.17±0.33)°,(0.14±0.34)°,(0.16± 0.28) ° respectively.Conclusions Besides the translational setup errors,a certain amount of rotational setup errors exist in radiotherapy of somal tumors and body metastases.By using the 6D setup error correction of the ExacTrac system,a translational less than 0.4 mm and rotational setup errors less than 0.2° could be achieved.
