title: Establishment of the Commissioning Procedure for Modifying the Beam Model of Helical Tomotherapy.
abstract: Although much evidence about the helical tomotherapy system are available, there is not a document about the procedure of quality assurance (QA) for changing the beam model. This study establishes the commissioning procedure for modifying the beam model of helical tomotherapy. Firstly, some intensity-modulated radiotherapy (IMRT) plans were created, and compared them with the calculated dose and the measured dose. Secondly, the absorbed doses to water in the machine-specific reference field and the plan-class specific reference field with a protocol in Japan; Standard Dosimetry of Absorbed Dose to Water in External Beam Radiotherapy (Standard Dosimetry 12) were measured. Thirdly, we reconfirmed patient-specific quality assurance. The recommended commissioning procedure after the change of the beam model was shown through three verification processes. This report would be helpful for not only changing the beam model of helical tomotherapy but also introducing Standard Dosimetry 12 to a clinic.
authors.affiliation: Department of Radiation Oncology, Aichi Cancer Center Central Hospital.
authors.forename: Hidetoshi
authors.initials: H
authors.lastname: Shimizu
authors.forename: Koji
authors.initials: K
authors.lastname: Sasaki
authors.forename: Manabu
authors.initials: M
authors.lastname: Iwata
authors.forename: Tadashi
authors.initials: T
authors.lastname: Nakabayashi
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Imamura
authors.forename: Kentaro
authors.initials: K
authors.lastname: Sugi
authors.forename: Takashi
authors.initials: T
authors.lastname: Kubota
authors.forename: Kazushi
authors.initials: K
authors.lastname: Yokoi
authors.forename: Kuniyasu
authors.initials: K
authors.lastname: Nakashima
authors.forename: Takeshi
authors.initials: T
authors.lastname: Kodaira
mesh_terms: D006801:Humans; D007564:Japan; D008962:Models, Theoretical; D011785:Quality Assurance, Health Care; D011874:Radiometry / Q000379:methods / Q000592:standards; D011879:Radiotherapy Dosage; D011880:Radiotherapy Planning, Computer-Assisted / Q000295:instrumentation / Q000379:methods*; D050397:Radiotherapy, Intensity-Modulated / Q000295:instrumentation / Q000379:methods*; D014867:Water
chemical_list: D014867:Water