title: Video techniques for on-line portal imaging.
abstract: The application of on-line portal imaging techniques to the verification of treatment precision is reviewed. The design parameters for a video portal imaging system are described, and the optimization of image quality is discussed with particular emphasis on photon noise. On-line images are presented for a head phantom imaged on a 4 MV linac, and compared with a conventional portal film. The relative advantages of an on-line system are compared with conventional portal film analysis.
authors.affiliation: Manitoba Cancer Treatment and Research Foundation, Winnipeg, Canada.
authors.forename: S
authors.initials: S
authors.lastname: Shalev
authors.forename: T
authors.initials: T
authors.lastname: Lee
authors.forename: K
authors.initials: K
authors.lastname: Leszczynski
authors.forename: S
authors.initials: S
authors.lastname: Cosby
authors.forename: T
authors.initials: T
authors.lastname: Chu
authors.forename: L
authors.initials: L
authors.lastname: Reinstein
authors.forename: A
authors.initials: A
authors.lastname: Meek
mesh_terms: D006801:Humans; D007090:Image Interpretation, Computer-Assisted / Q000295:instrumentation; D011881:Radiotherapy, Computer-Assisted; D014741:Video Recording / Q000379:methods*