[Basic requirements of a radiology information system (RIS)].
One of the most important problems in medicine today is quality control and the achievement of a cost-benefit analysis in the areas of both treatment and diagnosis. With modern software techniques, complex relations between medical and administrative data can be shown up and analysed. Preconditions are a vocabulary that can be processed by computer for medical facts and decisions and a database system capable of collecting a large amount of heterogeneous data and costing everything precisely. We have developed an object description language and, on the basis of the relational database approach, a complex system covering most aspects of medical and administrative data handling in radiology. The basic demands and elements of modern information handling in radiology are described and discussed.