1. MedSearch is a retrieval system for the medical literature
Angelos Hliaoutakis, Giannis Varelas, Euripides G.M. Petrakis, Evangelos Milios
MedSearch is a retrieval system for the medical literature
Medline: the premier bibliographic database of the U.S. NLM (15 million references)
SSRM is the retrieval model of MedSearch
Semantic Similarity Retrieval Model
Computes the similarity between documents containing semantically similar terms
Semantic Similarity: conceptual similarity between
terms using MeSH
Terms not necessarily lexicographically similar (“car” - “automobile”)
Term Similarity: Map two terms to an ontology and compute their relationship in that ontology
MeSH: ontology for medical and biological terms
SSRM Algorithm:
Input: Query q=(q1,q2,…qN), Document d=(d1,d2,…dN)
Preprocessing: Queries and documents are initially assigned tfxidf weights
Query term re-weighting
similar terms reinforce each other
Query expansion with synonyms
and similar terms and
term re-weighting
Document similarity
SSRM is evaluated
through OHSUMED
A standard TREC collection with 293,856
medical articles from MedLine
Retrieval methods:
SSRM (expansion T= 0.5, 0.9)
Vector Space Model (VSM)