MEDRank: Using graph-based concept ranking to index biomedical texts
► We define, implement and evaluate MEDRank. ► MEDRank is a graph-based algorithm that identifies important concepts in text. ► MEDRank improves retrieval of major Medical Subject Headings by 30%. ► Terms selected by MEDRank are match human expectations better than alternatives. As the volume of bio...
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| Vydáno v: | International journal of medical informatics (Shannon, Ireland) Ročník 80; číslo 6; s. 431 - 441 |
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| Médium: | Journal Article |
| Jazyk: | angličtina |
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Ireland
Elsevier Ireland Ltd
01.06.2011
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| ISSN: | 1386-5056, 1872-8243, 1872-8243 |
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| Abstract | ► We define, implement and evaluate MEDRank. ► MEDRank is a graph-based algorithm that identifies important concepts in text. ► MEDRank improves retrieval of major Medical Subject Headings by 30%. ► Terms selected by MEDRank are match human expectations better than alternatives.
As the volume of biomedical text increases exponentially, automatic indexing becomes increasingly important. However, existing approaches do not distinguish central (or core) concepts from concepts that were mentioned in passing. We focus on the problem of indexing MEDLINE records, a process that is currently performed by highly trained humans at the National Library of Medicine (NLM). NLM indexers are assisted by a system called the Medical Text Indexer (MTI) that suggests candidate indexing terms.
To improve the ability of MTI to select the core terms in MEDLINE abstracts. These core concepts are deemed to be most important and are designated as “major headings” by MEDLINE indexers. We introduce and evaluate a graph-based indexing methodology called MEDRank that generates concept graphs from biomedical text and then ranks the concepts within these graphs to identify the most important ones.
We insert a MEDRank step into the MTI and compare MTI's output with and without MEDRank to the MEDLINE indexers’ selected terms for a sample of 11,803 PubMed Central articles. We also tested whether human raters prefer terms generated by the MEDLINE indexers, MTI without MEDRank, and MTI with MEDRank for a sample of 36 PubMed Central articles.
MEDRank improved recall of major headings designated by 30% over MTI without MEDRank (0.489 vs. 0.376). Overall recall was only slightly (6.5%) higher (0.490 vs. 0.460) as was F
2 (3%, 0.408 vs. 0.396). However, overall precision was 3.9% lower (0.268 vs. 0.279). Human raters preferred terms generated by MTI with MEDRank over terms generated by MTI without MEDRank (by an average of 1.00 more term per article), and preferred terms generated by MTI with MEDRank and the MEDLINE indexers at the same rate.
The addition of MEDRank to MTI significantly improved the retrieval of core concepts in MEDLINE abstracts and more closely matched human expectations compared to MTI without MEDRank. In addition, MEDRank slightly improved overall recall and F
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| AbstractList | ► We define, implement and evaluate MEDRank. ► MEDRank is a graph-based algorithm that identifies important concepts in text. ► MEDRank improves retrieval of major Medical Subject Headings by 30%. ► Terms selected by MEDRank are match human expectations better than alternatives.
As the volume of biomedical text increases exponentially, automatic indexing becomes increasingly important. However, existing approaches do not distinguish central (or core) concepts from concepts that were mentioned in passing. We focus on the problem of indexing MEDLINE records, a process that is currently performed by highly trained humans at the National Library of Medicine (NLM). NLM indexers are assisted by a system called the Medical Text Indexer (MTI) that suggests candidate indexing terms.
To improve the ability of MTI to select the core terms in MEDLINE abstracts. These core concepts are deemed to be most important and are designated as “major headings” by MEDLINE indexers. We introduce and evaluate a graph-based indexing methodology called MEDRank that generates concept graphs from biomedical text and then ranks the concepts within these graphs to identify the most important ones.
We insert a MEDRank step into the MTI and compare MTI's output with and without MEDRank to the MEDLINE indexers’ selected terms for a sample of 11,803 PubMed Central articles. We also tested whether human raters prefer terms generated by the MEDLINE indexers, MTI without MEDRank, and MTI with MEDRank for a sample of 36 PubMed Central articles.
MEDRank improved recall of major headings designated by 30% over MTI without MEDRank (0.489 vs. 0.376). Overall recall was only slightly (6.5%) higher (0.490 vs. 0.460) as was F
2 (3%, 0.408 vs. 0.396). However, overall precision was 3.9% lower (0.268 vs. 0.279). Human raters preferred terms generated by MTI with MEDRank over terms generated by MTI without MEDRank (by an average of 1.00 more term per article), and preferred terms generated by MTI with MEDRank and the MEDLINE indexers at the same rate.
The addition of MEDRank to MTI significantly improved the retrieval of core concepts in MEDLINE abstracts and more closely matched human expectations compared to MTI without MEDRank. In addition, MEDRank slightly improved overall recall and F
2. Highlights ► We define, implement and evaluate MEDRank. ► MEDRank is a graph-based algorithm that identifies important concepts in text. ► MEDRank improves retrieval of major Medical Subject Headings by 30%. ► Terms selected by MEDRank are match human expectations better than alternatives. As the volume of biomedical text increases exponentially, automatic indexing becomes increasingly important. However, existing approaches do not distinguish central (or core) concepts from concepts that were mentioned in passing. We focus on the problem of indexing MEDLINE records, a process that is currently performed by highly trained humans at the National Library of Medicine (NLM). NLM indexers are assisted by a system called the Medical Text Indexer (MTI) that suggests candidate indexing terms. To improve the ability of MTI to select the core terms in MEDLINE abstracts. These core concepts are deemed to be most important and are designated as "major headings" by MEDLINE indexers. We introduce and evaluate a graph-based indexing methodology called MEDRank that generates concept graphs from biomedical text and then ranks the concepts within these graphs to identify the most important ones. We insert a MEDRank step into the MTI and compare MTI's output with and without MEDRank to the MEDLINE indexers' selected terms for a sample of 11,803 PubMed Central articles. We also tested whether human raters prefer terms generated by the MEDLINE indexers, MTI without MEDRank, and MTI with MEDRank for a sample of 36 PubMed Central articles. MEDRank improved recall of major headings designated by 30% over MTI without MEDRank (0.489 vs. 0.376). Overall recall was only slightly (6.5%) higher (0.490 vs. 0.460) as was F(2) (3%, 0.408 vs. 0.396). However, overall precision was 3.9% lower (0.268 vs. 0.279). Human raters preferred terms generated by MTI with MEDRank over terms generated by MTI without MEDRank (by an average of 1.00 more term per article), and preferred terms generated by MTI with MEDRank and the MEDLINE indexers at the same rate. The addition of MEDRank to MTI significantly improved the retrieval of core concepts in MEDLINE abstracts and more closely matched human expectations compared to MTI without MEDRank. In addition, MEDRank slightly improved overall recall and F(2). As the volume of biomedical text increases exponentially, automatic indexing becomes increasingly important. However, existing approaches do not distinguish central (or core) concepts from concepts that were mentioned in passing. We focus on the problem of indexing MEDLINE records, a process that is currently performed by highly trained humans at the National Library of Medicine (NLM). NLM indexers are assisted by a system called the Medical Text Indexer (MTI) that suggests candidate indexing terms.BACKGROUNDAs the volume of biomedical text increases exponentially, automatic indexing becomes increasingly important. However, existing approaches do not distinguish central (or core) concepts from concepts that were mentioned in passing. We focus on the problem of indexing MEDLINE records, a process that is currently performed by highly trained humans at the National Library of Medicine (NLM). NLM indexers are assisted by a system called the Medical Text Indexer (MTI) that suggests candidate indexing terms.To improve the ability of MTI to select the core terms in MEDLINE abstracts. These core concepts are deemed to be most important and are designated as "major headings" by MEDLINE indexers. We introduce and evaluate a graph-based indexing methodology called MEDRank that generates concept graphs from biomedical text and then ranks the concepts within these graphs to identify the most important ones.OBJECTIVETo improve the ability of MTI to select the core terms in MEDLINE abstracts. These core concepts are deemed to be most important and are designated as "major headings" by MEDLINE indexers. We introduce and evaluate a graph-based indexing methodology called MEDRank that generates concept graphs from biomedical text and then ranks the concepts within these graphs to identify the most important ones.We insert a MEDRank step into the MTI and compare MTI's output with and without MEDRank to the MEDLINE indexers' selected terms for a sample of 11,803 PubMed Central articles. We also tested whether human raters prefer terms generated by the MEDLINE indexers, MTI without MEDRank, and MTI with MEDRank for a sample of 36 PubMed Central articles.METHODSWe insert a MEDRank step into the MTI and compare MTI's output with and without MEDRank to the MEDLINE indexers' selected terms for a sample of 11,803 PubMed Central articles. We also tested whether human raters prefer terms generated by the MEDLINE indexers, MTI without MEDRank, and MTI with MEDRank for a sample of 36 PubMed Central articles.MEDRank improved recall of major headings designated by 30% over MTI without MEDRank (0.489 vs. 0.376). Overall recall was only slightly (6.5%) higher (0.490 vs. 0.460) as was F(2) (3%, 0.408 vs. 0.396). However, overall precision was 3.9% lower (0.268 vs. 0.279). Human raters preferred terms generated by MTI with MEDRank over terms generated by MTI without MEDRank (by an average of 1.00 more term per article), and preferred terms generated by MTI with MEDRank and the MEDLINE indexers at the same rate.RESULTSMEDRank improved recall of major headings designated by 30% over MTI without MEDRank (0.489 vs. 0.376). Overall recall was only slightly (6.5%) higher (0.490 vs. 0.460) as was F(2) (3%, 0.408 vs. 0.396). However, overall precision was 3.9% lower (0.268 vs. 0.279). Human raters preferred terms generated by MTI with MEDRank over terms generated by MTI without MEDRank (by an average of 1.00 more term per article), and preferred terms generated by MTI with MEDRank and the MEDLINE indexers at the same rate.The addition of MEDRank to MTI significantly improved the retrieval of core concepts in MEDLINE abstracts and more closely matched human expectations compared to MTI without MEDRank. In addition, MEDRank slightly improved overall recall and F(2).CONCLUSIONSThe addition of MEDRank to MTI significantly improved the retrieval of core concepts in MEDLINE abstracts and more closely matched human expectations compared to MTI without MEDRank. In addition, MEDRank slightly improved overall recall and F(2). As the volume of biomedical text increases exponentially, automatic indexing becomes increasingly important. However, existing approaches do not distinguish central (or core) concepts from concepts that were mentioned in passing. We focus on the problem of indexing MEDLINE records, a process that is currently performed by highly trained humans at the National Library of Medicine (NLM). NLM indexers are assisted by a system called the Medical Text Indexer (MTI) that suggests candidate indexing terms. Objective: To improve the ability of MTI to select the core terms in MEDLINE abstracts. These core concepts are deemed to be most important and are designated as "major headings" by MEDLINE indexers. We introduce and evaluate a graph-based indexing methodology called MEDRank that generates concept graphs from biomedical text and then ranks the concepts within these graphs to identify the most important ones. Methods: We insert a MEDRank step into the MTI and compare MTI's output with and without MEDRank to the MEDLINE indexers' selected terms for a sample of 11,803 PubMed Central articles. We also tested whether human raters prefer terms generated by the MEDLINE indexers, MTI without MEDRank, and MTI with MEDRank for a sample of 36 PubMed Central articles. Results: MEDRank improved recall of major headings designated by 30% over MTI without MEDRank (0.489 vs. 0.376). Overall recall was only slightly (6.5%) higher (0.490 vs. 0.460) as was F sub(2 (3%, 0.408 vs. 0.396). However, overall precision was 3.9% lower (0.268 vs. 0.279). Human raters preferred terms generated by MTI with MEDRank over terms generated by MTI without MEDRank (by an average of 1.00 more term per article), and preferred terms generated by MTI with MEDRank and the MEDLINE indexers at the same rate. Conclusions: The addition of MEDRank to MTI significantly improved the retrieval of core concepts in MEDLINE abstracts and more closely matched human expectations compared to MTI without MEDRank. In addition, MEDRank slightly improved overall recall and F) sub(2). |
| Author | Cohen, Trevor Herskovic, Jorge R. Bernstam, Elmer V. Iyengar, M. Sriram Smith, Jack W. Subramanian, Devika |
| AuthorAffiliation | 2 Rice University Engineering School, Department of Computer Science 4 Department of Internal Medicine, Medical School, The University of Texas Health Science Center at Houston 1 School of Biomedical Informatics, The University of Texas Health Science Center at Houston 3 NASA Johnson Space Center |
| AuthorAffiliation_xml | – name: 4 Department of Internal Medicine, Medical School, The University of Texas Health Science Center at Houston – name: 1 School of Biomedical Informatics, The University of Texas Health Science Center at Houston – name: 2 Rice University Engineering School, Department of Computer Science – name: 3 NASA Johnson Space Center |
| Author_xml | – sequence: 1 givenname: Jorge R. surname: Herskovic fullname: Herskovic, Jorge R. organization: School of Biomedical Informatics, The University of Texas Health Science Center at Houston, United States – sequence: 2 givenname: Trevor surname: Cohen fullname: Cohen, Trevor organization: School of Biomedical Informatics, The University of Texas Health Science Center at Houston, United States – sequence: 3 givenname: Devika surname: Subramanian fullname: Subramanian, Devika organization: Rice University Engineering School, Department of Computer Science, United States – sequence: 4 givenname: M. Sriram surname: Iyengar fullname: Iyengar, M. Sriram organization: School of Biomedical Informatics, The University of Texas Health Science Center at Houston, United States – sequence: 5 givenname: Jack W. surname: Smith fullname: Smith, Jack W. organization: School of Biomedical Informatics, The University of Texas Health Science Center at Houston, United States – sequence: 6 givenname: Elmer V. surname: Bernstam fullname: Bernstam, Elmer V. email: elmer.v.bernstam@uth.tmc.edu organization: School of Biomedical Informatics, The University of Texas Health Science Center at Houston, United States |
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| Cites_doi | 10.1197/jamia.M1909 10.1086/392651 10.1016/j.jbi.2006.06.004 10.1016/j.jbi.2008.12.007 10.1016/j.jbi.2009.02.002 10.1016/j.jbi.2009.09.003 |
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| Snippet | ► We define, implement and evaluate MEDRank. ► MEDRank is a graph-based algorithm that identifies important concepts in text. ► MEDRank improves retrieval of... Highlights ► We define, implement and evaluate MEDRank. ► MEDRank is a graph-based algorithm that identifies important concepts in text. ► MEDRank improves... As the volume of biomedical text increases exponentially, automatic indexing becomes increasingly important. However, existing approaches do not distinguish... |
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| SubjectTerms | Abstracting and Indexing - methods Abstracting and indexing as topic Algorithms Artificial Intelligence Automatic data processing Digital libraries Electronic Data Processing Humans Information Storage and Retrieval Internal Medicine Medical informatics Medical Subject Headings MEDLINE National Library of Medicine (U.S.) Natural language processing Other PubMed Software United States |
| Title | MEDRank: Using graph-based concept ranking to index biomedical texts |
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