J Am Med Inform Assoc - A la Recherche du Temps Perdu: extracting temporal relations from medical text in the 2012 i2b2 NLP challenge.

Tópicos

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Resumo

JECTIVE: An analysis of the timing of events is critical for a deeper understanding of the course of events within a patient record. The 2012 i2b2 NLP challenge focused on the extraction of temporal relationships between concepts within textual hospital discharge summaries.MATERIALS AND METHODS: The team from the National Research Council Canada (NRC) submitted three system runs to the second track of the challenge: typifying the time-relationship between pre-annotated entities. The NRC system was designed around four specialist modules containing statistical machine learning classifiers. Each specialist targeted distinct sets of relationships: local relationships, 'sectime'-type relationships, non-local overlap-type relationships, and non-local causal relationships.RESULTS: The best NRC submission achieved a precision of 0.7499, a recall of 0.6431, and an F1 score of 0.6924, resulting in a statistical tie for first place. Post hoc improvements led to a precision of 0.7537, a recall of 0.6455, and an F1 score of 0.6954, giving the highest scores reported on this task to date.DISCUSSION AND CONCLUSIONS: Methods for general relation extraction extended well to temporal relations, and gave top-ranked state-of-the-art results. Careful ordering of predictions within result sets proved critical to this success.

Resumo Limpo

jectiv analysi time event critic deeper understand cours event within patient record ib nlp challeng focus extract tempor relationship concept within textual hospit discharg summariesmateri method team nation research council canada nrc submit three system run second track challeng typifi timerelationship preannot entiti nrc system design around four specialist modul contain statist machin learn classifi specialist target distinct set relationship local relationship sectimetyp relationship nonloc overlaptyp relationship nonloc causal relationshipsresult best nrc submiss achiev precis recal f score result statist tie first place post hoc improv led precis recal f score give highest score report task datediscuss conclus method general relat extract extend well tempor relat gave toprank stateoftheart result care order predict within result set prove critic success

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