title: Electronic portal imaging.
abstract: In our institute, we have developed an electronic portal imaging system based on a matrix of 256 x 256 ionisation chambers. By improvements to the electronics, the system produces images with the same quality as the original system but 3-10 times faster. Software for automatic image analysis has been applied to more than 10,000 images over the last two years. Using an off-line correction strategy, the systematic patient set-up error has been limited to 5 mm or less for 98% of the patients treated for prostate cancer.
authors.affiliation: Radiotherapy Department, Netherlands Cancer Institute, Amsterdam.
authors.forename: M
authors.initials: M
authors.lastname: van Herk
authors.forename: A
authors.initials: A
authors.lastname: Bel
authors.forename: K G
authors.initials: KG
authors.lastname: Gilhuijs
authors.forename: J V
authors.initials: JV
authors.lastname: Lebesque
authors.forename: A
authors.initials: A
authors.lastname: van Dalen
authors.forename: P
authors.initials: P
authors.lastname: van der Ven
authors.forename: R
authors.initials: R
authors.lastname: Vijlbrief
mesh_terms: D004867:Equipment Design; D006801:Humans; D007091:Image Processing, Computer-Assisted; D010386:Pelvic Neoplasms / Q000532:radiotherapy; D010388:Pelvis / Q000528:radiation effects; D011785:Quality Assurance, Health Care; D011879:Radiotherapy Dosage; D011880:Radiotherapy Planning, Computer-Assisted / Q000295:instrumentation / Q000379:methods; D011882:Radiotherapy, High-Energy; D015203:Reproducibility of Results