title: [Investigation of Elekta linac characteristics for VMAT].
abstract: The aim of this study is to investigate the characteristics of Elekta delivery system for volumetric modulated arc therapy (VMAT). Five VMAT plans were delivered in service mode and dose rates, and speed of gantry and MLC leaves were analyzed by log files. Results showed that dose rates varied between 6 dose rates. Gantry and MLC leaf speed dynamically varied during delivery.
  
  
  CONCLUSIONS
  The technique of VMAT requires linac to dynamically control more parameters, and these key dynamic variables during VMAT delivery can be checked by log files. Quality assurance procedure should be carried out for VMAT related parameter.
authors.affiliation: Radiation Oncology Department, Sun Yat-Sen University Cancer Center, China State Key Laboratory of Oncology in Southern China, Guangzhou, 510060. gantry@163.com
authors.forename: Guangwen
authors.initials: G
authors.lastname: Luo
authors.forename: Kunyi
authors.initials: K
authors.lastname: Zhang
mesh_terms: D006801:Humans; D010315:Particle Accelerators; D011879:Radiotherapy Dosage; D050397:Radiotherapy, Intensity-Modulated / Q000295:instrumentation* / Q000379:methods*