The measurement and analysis of output factor of lead block fields for high energy electron beam of Varian 2300 C/D linear accelerator / 中国医学物理学杂志

ABSTRACT

Purpose: To analyses the variation regularity of output factor of lead block fields for high energy electron beam of Varian 2300 C/D linear accelerator. Methods: Output factors of lead block fields were measured for four standard applicators under various electron beam energy. Results: The variations of output factor with field side or with applicators size were no obvious regularity Output factor of lead block fields was related to standard applicators size and lead block fields side Output factor of lead block fields was related to electron beam energy. Conclusion: Electron beam energy, standard applicator size and lead block fields side had a obvious influence upon output factor. The accurate measurement should be performed for use electron beam energy in the clinic.