J Am Med Inform Assoc - Eventual situations for timeline extraction from clinical reports.

Tópicos

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Resumo

JECTIVE: To identify the temporal relations between clinical events and temporal expressions in clinical reports, as defined in the i2b2/VA 2012 challenge.DESIGN: To detect clinical events, we used rules and Conditional Random Fields. We built Random Forest models to identify event modality and polarity. To identify temporal expressions we built on the HeidelTime system. To detect temporal relations, we systematically studied their breakdown into distinct situations; we designed an oracle method to determine the most prominent situations and the most suitable associated classifiers, and combined their results.RESULTS: We achieved F-measures of 0.8307 for event identification, based on rules, and 0.8385 for temporal expression identification. In the temporal relation task, we identified nine main situations in three groups, experimentally confirming shared intuitions: within-sentence relations, section-related time, and across-sentence relations. Logistic regression and Na?ve Bayes performed best on the first and third groups, and decision trees on the second. We reached a 0.6231 global F-measure, improving by 7.5 points our official submission.CONCLUSIONS: Carefully hand-crafted rules obtained good results for the detection of events and temporal expressions, while a combination of classifiers improved temporal link prediction. The characterization of the oracle recall of situations allowed us to point at directions where further work would be most useful for temporal relation detection: within-sentence relations and linking History of Present Illness events to the admission date. We suggest that the systematic situation breakdown proposed in this paper could also help improve other systems addressing this task.

Resumo Limpo

jectiv identifi tempor relat clinic event tempor express clinic report defin ibva challengedesign detect clinic event use rule condit random field built random forest model identifi event modal polar identifi tempor express built heideltim system detect tempor relat systemat studi breakdown distinct situat design oracl method determin promin situat suitabl associ classifi combin resultsresult achiev fmeasur event identif base rule tempor express identif tempor relat task identifi nine main situat three group experiment confirm share intuit withinsent relat sectionrel time acrosssent relat logist regress nave bay perform best first third group decis tree second reach global fmeasur improv point offici submissionconclus care handcraft rule obtain good result detect event tempor express combin classifi improv tempor link predict character oracl recal situat allow us point direct work use tempor relat detect withinsent relat link histori present ill event admiss date suggest systemat situat breakdown propos paper also help improv system address task

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