Applying Lemur Query Expansion Techniques in Biomedical Information Retrieval

  • A. R. Rivas
  • L. Borrajo
  • E. L. Iglesias
  • R. Romero
Part of the Advances in Intelligent and Soft Computing book series (AINSC, volume 151)

Abstract

The increase in the amount of available biomedical information has resulted in a higher demand on biomedical information retrieval systems. However, traditional information retrieval systems do not achieve the desired performance in this area. Query expansion techniques have improved the effectiveness of ranked retrieval by automatically adding additional terms to a query. In this work we test several automatic query expansion techniques using the Lemur Language Modelling Toolkit. The objective is to evaluate a set of query expansion techniques when they are applied to biomedical information retrieval. In the first step of the information retrieval searching, indexing, we compare the use of several techniques of stemming and stopwords. In the second step, matching, we compare the well-known weighting algorithms Okapi and TF-IDF BM25. The best results are obtained with the combination of Krovetz stemmer, SMART stopword list and TF-IDF. Moreover, we analyze the document retrieval based on Abstract, Title and Mesh fields. We conclude that seems more effective than looking at each of these fields individually. Also, we show that the use of feedback in document retrieval results a improvement in retrieving. The corpus used in the experiments was extracted from the biomedical text Cystic Fibrosis Corpus (CF).

Keywords

Query expansion Biomedical information retrieval Lemur MEDLINE 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  • A. R. Rivas
    • 1
  • L. Borrajo
    • 1
  • E. L. Iglesias
    • 1
  • R. Romero
    • 1
  1. 1.Computer Science Dept.Univ. of VigoVigoSpain

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