Analysis of the influence of tracking error of Xsight lung tracking system caused by cardiac beating
Xiao Feng1,2, Chang Yu3, Quan Hong2, Yang Zhiyong3
1Department of Radiotherapy, Shaanxi Provincial Cancer Hospital, Xi'an 710061, China; 2School of Physics and Technology, Wuhan University, Wuhan 430072, China; 3Cancer Center, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China
Abstract：Objective To analyze the influence of tracking error of Xsight lung tracking system caused by cardiac beating. Methods 48 patients with lung tumors adjacent to the heart were enrolled into this study. The tumor movement curves were collected by the Xsight lung tracking system and recorded in the treatment log files during the Cyberknife treatment process. The curves were subject to filtering analysis and the respiratory motion of < 1Hz and the cardiac beating motion of > 1Hz were separated. According to the filtering results, the patient treatment tracking data were divided into two groups based on whether the cardiac beating wave of >1Hz existed. The tracking errors were statistically compared between two groups based on the X-ray imaging data collected by Xsight lung tracking system during treatment. Results For the fractionation with cardiac beat information, the tracking errors of the patient′s related models were (1.45 ± 0.99),(0.46 ± 0.21) and (0.70 ± 0.54)mm in the left-right, superior-inferior and anterior-posterior direction, respectively. For the fractionation without cardiac beat information, the tracking errors of the patient′s related models were (1.52 ± 1.17),(0.63 ± 0.37) and (1.07 ± 0.62)mm in the left-right, superior-inferior and anterior-posterior direction, respectively. The tracking errors in the superior-inferior and anterior-posterior direction of patients with accurate cardiac beat models were 28.34% and 34.86% less than those of their counterparts without accurate cardiac beat models and there was significant difference (both P<0.05). Conclusion The tracking accuracy of Xsight lung tracking system will be significantly improved if the cardiac beat model is accurately established.
Xiao Feng,Chang Yu,Quan Hong et al. Analysis of the influence of tracking error of Xsight lung tracking system caused by cardiac beating[J]. Chinese Journal of Radiation Oncology, 2021, 30(10): 1054-1058.
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