title: Intelligent image retrieval based on radiology reports.
abstract: OBJECTIVE
  To create an advanced image retrieval and data-mining system based on in-house radiology reports.
  
  
  METHODS
  Radiology reports are semantically analysed using natural language processing (NLP) techniques and stored in a state-of-the-art search engine. Images referenced by sequence and image number in the reports are retrieved from the picture archiving and communication system (PACS) and stored for later viewing. A web-based front end is used as an interface to query for images and show the results with the retrieved images and report text. Using a comprehensive radiological lexicon for the underlying terminology, the search algorithm also finds results for synonyms, abbreviations and related topics.
  
  
  RESULTS
  The test set was 108 manually annotated reports analysed by different system configurations. Best results were achieved using full syntactic and semantic analysis with a precision of 0.929 and recall of 0.952. Operating successfully since October 2010, 258,824 reports have been indexed and a total of 405,146 preview images are stored in the database.
  
  
  CONCLUSIONS
  Data-mining and NLP techniques provide quick access to a vast repository of images and radiology reports with both high precision and recall values. Consequently, the system has become a valuable tool in daily clinical routine, education and research.
  
  
  CONCLUSIONS
  Radiology reports can now be analysed using sophisticated natural language-processing techniques. Semantic text analysis is backed by terminology of a radiological lexicon. The search engine includes results for synonyms, abbreviations and compositions. Key images are automatically extracted from radiology reports and fetched from PACS. Such systems help to find diagnoses, improve report quality and save time.
authors.affiliation: Department of Diagnostic Radiology, University Medical Center Freiburg, Hugstetterstrasse 55, 79106, Freiburg, Germany. axel.gerstmair@uniklinik-freiburg.de
authors.forename: Axel
authors.initials: A
authors.lastname: Gerstmair
authors.forename: Philipp
authors.initials: P
authors.lastname: Daumke
authors.forename: Kai
authors.initials: K
authors.lastname: Simon
authors.forename: Mathias
authors.initials: M
authors.lastname: Langer
authors.forename: Elmar
authors.initials: E
authors.lastname: Kotter
mesh_terms: D000465:Algorithms; D057225:Data Mining; D006801:Humans; D016247:Information Storage and Retrieval / Q000379:methods*; D009323:Natural Language Processing; D011873:Radiology Information Systems; D057386:Search Engine; D012660:Semantics; D012984:Software; D014584:User-Computer Interface