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Query expansion for medical information retrieval
Bibyna, Feraena ; Pecina, Pavel (advisor) ; Holub, Martin (referee)
One of the challenges in medical information retrieval is the terminology gap between the documents (commonly written by medical professional, using medical jargons), and the queries (commonly composed by non professional, using layman terms). In this thesis, we investigate the effect of query expansion, using domain-specific knowledge resource, to deal with this challenge. We use the Unified Medical Language System (UMLS), a repository of biomedical vocabularies, and utilize two of its resources: the Metathesaurus and the Semantic Network. We use the query set and document set provided by CLEF eHealth organizer. The query sets, provided for the medical information retrieval shared task, represent two different use cases of medical information retrieval. We experiment with query expansion using synonymous terms and non-synonymous concepts, blind relevance feedback, field weighting, and linear interpolation of different systems. Powered by TCPDF (www.tcpdf.org)
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International Nomenclatures and Metathesauruses in Healthcare
Přečková, Petra
The article describes various international nomenclatures and metathesauri used in healthcare. The main emphasis is put on UMLS, especially on UMLS Methasaurus, which we use for mapping of professional health terminology. The article describes efforts to verify practical usability of internationally used terminological thesauri and classifications. For that purpose attributes of Minimal Data Model for Cardiology, Data Standard of Ministry of Health of CR and chosen commercial hospital systems are used.
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SPECIALIST Lexicon and the Czech Language
Přečková, Petra
The article focuses on the SPECIALIST lexicon, one of three UMLS knowledge sources. Its aim is to create a general English lexicon containing many biomedical terms. Each entry in the lexicon describes syntactic, morphologic, and orthographic information needed for natural language processing. As there is no such a lexicon for the Czech language, the article describes also the analysis of the Czech language that could help in integrating Czech to the lexicon.
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