Abstract
Quality assurance (QA) system in modern radiotherapy has been established in the United States early in the 1990's followed by European countries. In Japan, similar research started only several years ago, especially in clinical aspect. QA system includes three major categories; namely, structure, process and outcome. Modern radiation therapy is so complex that close relationships among radiation oncologists, medical physicists, radiation technologists, nurses are essential and their responsibility should be clarified. This article reviewed recent advances in QA system in the U. S. and Europe and referred to several QA programs in Japan and Gunma Prefecture.
