title: Progress in the evaluation of electronic portal imaging--taking one step at a time.
authors.forename: S
authors.initials: S
authors.lastname: Shalev
mesh_terms: D006801:Humans; D007091:Image Processing, Computer-Assisted; D011168:Portal System / Q000000981:diagnostic imaging*; D011859:Radiography; D011878:Radiotherapy / Q000379:methods*