Feasibility of X-ray field area optimization for Cyberknife image guidance
10.19745/j.1003-8868.2024214
- VernacularTitle:射波刀影像引导下X射线射野面积优化的可行性研究
- Author:
Rui ZHAO
1
;
Jing ZHANG
;
Xing-Xin GAO
;
Zhong-Ze TIAN
;
Xiao-Bo CAO
;
Sha LI
Author Information
1. 联勤保障部队第940医院放疗科,兰州 730050
- Keywords:
Cyberknife;
image-guided radiotherapy;
field area;
spine tracking;
fiducial tracking;
lung tracking;
radiation prevention
- From:
Chinese Medical Equipment Journal
2024;45(11):49-53
- CountryChina
- Language:Chinese
-
Abstract:
Objective To investigate the effect of reducing the image-guided X-ray field area on the accuracy of Cyberknife radiotherapy,in order to provide a feasible method for achieving patient protection optimization.Methods Firstly,the spine-tracking,fiducial tracking and lung-tracking radiotherapy plans were formulated for the simulation phantom,and then image-guided full-field localization and position pre-setting were carried out for the simulation phantom,and the spine-tracking,fiducial tracking and lung-tracking radiotherapy plans were executed for the simulation phantom using a reduced lead block field area,respectively.Secondly,the radiotherapy accuracy of different radiotherapy plans was verified by end-to-end(E2E)software using new EBT films of the same batch as the base film.Finally,the changes of the simulation phantom were compared in terms of position pre-presetting error,radiotherapy accuracy and lead block field area.Results The spine-tracking and fiducial tracking radiotherapy plans had the translation errors not higher than 0.1 mm and the rotation errors not higher than 0.1°,which were comparable to the fluctuated conventional Cyberknife image-guided locating;the spine-tracking,fiducial tracking and lung-tracking radiotherapy plans had the lead block field radiotherapy accu-racies being 0.71,0.18 and 1.06 mm,respectively,which met the clinical requirements for Cyberknife radiotherapy;the lead block field areas of the spine-tracking,fiducial tracking and lung-tracking radiotherapy plans were reduced to 19.75％,29.28％and 12.71％of the full field area,respectively,and the efficacy for field area optimization was significant.Conclusion It's feasible to involve a reduced image-guided X-ray field area in Cyberknife radiotherapy,which contributes to optimizing radiation protection for the patients.[Chinese Medical Equipment Journal,2024,45(11):49-53]
