Abstract

Info

Title:: Effects of respiratory motion on the dosimetry of Sliding Window intensity-modulated radiotherapy

Author(s):: MU Jinming; TIAN Yuan; DAI Jianrong; National Cancer Center/National Clinial Research Canter for Cancer/Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100021, China

Keywords:: ; Keywords: intensity-modulated radiotherapy; respiratory motion; Sliding Window; dose distribution

Abstract:: Abstract: Objective To study the dosimetric effects of respiratory motion in Sliding Window intensity-modulated radiotherapy. Methods The dose distributions with different motion modes, field widths and velocities of multileaf collimators were obtained and compared using EBT2 films driven by respiratory phantom (Quasar). The effects of motion modes, field widths and velocities of multileaf collimators on the dose distribution were analyzed. Results The effects of different motion modes on the dose distribution was significantly different. With the increase of leaf velocity, the dose fluctuation amplitude was obviously increased, and with the increase of the field width, the dose fluctuation amplitude was decreased. The large field width with high leaf velocity had the most significant effects on the dose distribution. Conclusion With the influence of respiratory motion, the effects of respiratory motion on the dose distribution can be reduced by increasing the field width and (or) decreasing the leaf velocity.