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Comparison of the performance of two methods to determine set-up errors for DIBH patients with left sided breast cancer in radiotherapy
Li Tantan, Zhang Jianghu, Song Yongwen, Tang Yu, Qi Shunan, Lu Fengyu, Zhang Wei, Wang Zengzhou, Feng Xin, Qin Shirui, Cheng Bin, Liu Bofei, Fu Guishan, Wang Shulian, Dai Jianrong
Department of Radiation Oncology,National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital,Chinese Academy of Medical Sciences and Peking Union Medical College,Beijing 100021,China
AbstractObjective To establish the basic procedures of the application of optical surface monitoring system (OSMS) in the deep inspiration breath hold (DIBH) radiotherapy for patients with left sided breast cancer and compare the performance of OSMS and cone-beam CT (CBCT) in the determination of the set-up errors of DIBH radiotherapy for patients with left sided breast cancer. Methods Twenty patients with left sided breast cancer received DIBH radiotherapy. Through the registration of CBCT images with the planning CT images,and the registration of OSMS radiography images with the outer contour of the body surface,translational set-up errors and rotational errors were determined along the lateral-medial (Rx), superior-inferior (Ry) and anterior-posterior (Rz) directions. Pearson correlation analysis was performed to evaluate the correlation of the set-up errors determined by two methods,and Bland-Altman plot analysis was used to assess the coincidence of these two methods. Results Two methods were positively correlated. The Rz volume was 0.84,0.74 and 0.84 in the x,y and z directions,and 0.65,0.41 and 0.54 in the Rx,Ry and Rz directions,respectively (all P<0.01). The 95%CI of agreement were within preset 5 mm tolerance (-0.37-0.42cm,-0.39-0.41cm,-0.29-0.49cm) in x,y and z directions for two methods. The 95%CI of agreement were within preset 3 ° tolerance -2.9°-1.4°,-2.6°-1.4°,-2.4°-2.5°in Rx,Ry and Rz directions for two methods. The system errors of 20 patients with left sided breast cancer receiving DIBH radiotherapy were <0.18cm and the random errors were <0.24cm. Conclusions OSMS is equivalent to CBCT in the determination and stimulation of set-up errors for patients with left sided breast cancer receiving DIBH radiotherapy. The combination of CBCT and OSMS is a safe and reliable method.
Fund:National Major Special Project (2016YFC0904600); Fundamental Research Funds for the Central Universities (3332019051)
Corresponding Authors:
Dai Jiangrong,Email:dai_jianrong@163.com
Cite this article:
Li Tantan,Zhang Jianghu,Song Yongwen et al. Comparison of the performance of two methods to determine set-up errors for DIBH patients with left sided breast cancer in radiotherapy[J]. Chinese Journal of Radiation Oncology, 2020, 29(4): 278-282.
Li Tantan,Zhang Jianghu,Song Yongwen et al. Comparison of the performance of two methods to determine set-up errors for DIBH patients with left sided breast cancer in radiotherapy[J]. Chinese Journal of Radiation Oncology, 2020, 29(4): 278-282.
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2020, Vol. 29 
