Effectiveness of Two Different Therapeutic Set-up Methods on the
Accuracy of the Location of Tumor in Radiotherapy When the Sagittal
Laser Line is Obscured
XU Shi-fei, WANG Xiao-yong,
ZHANG Gong, LIU Hui,
XU Hong-peng
Department of Radiotherapy and
Chemotherapy, Zhongnan Hospital of
Wuhan University, Wuhan Hubei 430071,
China
Abstract：Objective In order to provide guidance for locating tumor in clinical radiotherapy, the effectiveness
of two different therapeutic set-up methods on the accuracy of the location of tumor in radiotherapy was
analysed when the sagittal laser line was obscured. Methods Specific location of experimental models which
made by thermoplastic film of head, neck and shoulder were marked with tag lines of radiotherapy via the
VARIAN IX linear accelerator and recorded the corresponding couch position. The actual couch position and
the reference couch position were set up and recorded with method A and method B respectively. Finally, the
results were analyzed. Results The differences between the actual set-up couch position and the reference
couch position in the direction of Vertical (VRT), Longitudinal (LNG) and Lateral (LAT) by the method A
and B set-up were as follows: (0.35±0.65)mm, (0.88±1.12)mm, (0.63±1.37)mm and (0.25±0.75)mm,
(0.9±1.1)mm, (2.43±2.57)mm. Comparing the set-up errors between method A and B, there were no
statistically significant differences (P>0.05) in the direction of VRT and LNG, and statistically significant
differences existed (P=0.000) in LAT direction. Conclusion More differences originate from the different setup
methods about left and right position, which causes error for patient during therapeutic set-ups when the
sagittal laser line is obscured. Therefore, it is important to use the “+” sign method (method A) strictly and
comparatively during the therapeutic set-up for patients.
徐士飞，王骁踊，张弓，刘晖，
徐鸿鹏. 矢状线激光线被遮挡时两种不同治疗性
摆位方法对肿瘤放疗位置准确性的影响[J]. 中国医疗设备, 2016, 31(1): 113-115.
XU Shi-fei, WANG Xiao-yong,
ZHANG Gong, LIU Hui,
XU Hong-peng. Effectiveness of Two Different Therapeutic Set-up Methods on the
Accuracy of the Location of Tumor in Radiotherapy When the Sagittal
Laser Line is Obscured. China Medical Devices, 2016, 31(1): 113-115.
