SINAI at ImageCLEF 2007

This paper describes the SINAI team participation in the ImageCLEF campaign. The SINAI research group has participated in both the ad hoc task and the medical task. The experiments accomplished in both cases result from very different approaches. For the ad hoc task the main Information Retrieval (IR) system used combines the document lists retrieved by two IR systems, and uses online translators for the bilingual experiments. For the medical task, we have used the MeSH ontology to expand the queries. The expansion consists in searching terms of the query in the MeSH ontology in order to add similar terms. We have processed the set of collections using Information Gain (IG) in the same way as in ImageCLEFmed 2006.