To provide access to research material for researchers and physicians of the Athens Medical School (AMS), a Digital Library system (AMS DL) was developed. It maintains medical images produced by the laboratories of the School. End-users access the system through the Web. Images are catalogued and processed partially by laboratory scientific staff and partially by cataloguers in the Central Library of Health Sciences. The AMS DL system is based on a multi-tiered client-server model and is implemented using Java and the IBM Content Manager platform [1]. Since the system should be open, it supports existing standards regarding the metadata scheme and communication interfaces. Thus, the metadata scheme adopted is an extension of Dublin Core, while results are obtained as XML pages [2].