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The Medical Text Indexer (MTI) system was developed as part of the U. S. National Library of Medicine’s (NLM) Indexing Initiative. MTI produces both semi- and fully-automated indexing recommendations based on the Medical Subject Headings (MeSH®) controlled vocabulary and has been in use at NLM since mid-2000. MTI is in daily use to assist Indexers, Catalogers, and NLM’s History of Medicine Division (HMD) in their indexing efforts. Every weeknight MTI provides recommendations for 5,000 to 8,000 new citations for Indexing and processes a mixed file of approximately 9,000 old and new records for both Cataloging and HMD. MTI is also used on a regular basis to provide fully-automated keyword indexing for NLM’s Gateway meeting abstract collection which is not manually indexed. Indexers and Revisers review MTI recommendations for approximately 45% of the articles they are indexing, and the MTI recommendations are tightly integrated into the Cataloging and HMD system. Although mainly used in indexing efforts for processing MEDLINE® formatted citations consisting of identifier, title, and abstract, MTI is also capable of processing arbitrary biomedical text.
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February 2, 2011 - MTI became the first line indexer for a small set of journals. This means that for these journals, MTI is acting as the indexer and not simply recommending indexing terms. The indexing that MTI provides for these journals is still manually reviewed.
