Abstract

Info

Title:: A rapid method for gantry angle determination in total skin electron therapy

Author(s):: JI Weixing; ZHANG Yujie; LI Tingting; ZHANG Jianying; Department of Radiation Oncology, Zhongshan Hospital, Fudan University, Shanghai 200032, China

Keywords:: total skin electron therapy six-dual-field technique gantry angle

Abstract:: Objective To provide a method for rapidly determining the gantry angle in six-dual-field total skin electron therapy. Methods A new factor F which was related to the geometric conditions of radiation field such as gantry angle, collimator size and source-skin-distance was introduced. According to the rules of F under different geometric conditions which were summarized by referring the previous literatures, a rapid method for gantry angle determination was proposed. The effectiveness of the method was verified by two groups of experiments. Results The analysis of the data from the previous literatures showed that F was stable at a fixed value, with mean value of 0.79 and standard deviation of 0.05. The proposed method narrowed the search range of gantry angle from the generally recommended 15° to about 5°. In the two groups of experiments, the optimal gantry angle could be determined quickly and accurately. Conclusion The introduction of F and the novel calculation method improve the efficiency for the determination of the gantry angle in six-dual-field total skin electron therapy.