Purpose: To create an on-line assessment center in Radiology oriented to the users' expertise in Radiology. Materials and methods: More than 1000 radiological cases were collected, digitized and transmitted to the Internet. The program is structured in different levels. This HTML-assessment center is based on a collection of common gateway interface scripts (CGI-scripts). Thus the communication between the static HTML-page of the client and a data base is realized. After authentication users will get randomized case-based questions with either single or multiple choice answers. The users' answers will be statistically evaluated and a result of the personal evaluation will be presented. Depending on the same authentication the user may compare the results out of different assessment sessions. Results: Users, medical students as well as residents in Radiology and radiologists appreciate the on-line assessment center in Radiology as a challenging, free web-based program. This program enables single evaluation as well as long term evaluations of the users' personal expertise in Radiology. Conclusion: The on-line assessment center in Radiology is a useful contribution to current medical education in Radiology. In the future this program may offer the possibility to get CME credit points according to the users' score. The program will be extended and updated regularly.
