title: [PIV: a computer-aided portal image verification system].
abstract: Portal image verification (PIV) is one of the key actions in QA procedure for sophisticated accurate radiotherapy. The purpose of this study was to develop a PIV software as a tool for improving the accuracy and visualization of portal field verification and computing field placement errors. PIV was developed in the visual C++ integrated environment under Windows 95 operating system. It can improve visualization by providing tools for image processing and multimode images display. Semi-automatic register methods make verification more accurate than view-box method. It can provide useful quantitative errors for regular fields. PIV is flexible and accurate. It is an effective tool for portal field verification.
authors.affiliation: Department of Radiotherapy Oncology, Cancer Institute (Hospital), Peking Union Medical College, Chinese Academy of Medical Sciences, Beijing 100021.
authors.forename: Weihua
authors.initials: W
authors.lastname: Fu
authors.forename: Hongzhi
authors.initials: H
authors.lastname: Zhang
authors.forename: Jing
authors.initials: J
authors.lastname: Wu
mesh_terms: D000465:Algorithms; D011881:Radiotherapy, Computer-Assisted / Q000295:instrumentation* / Q000379:methods; D012984:Software