ConText: an algorithm for determining negation, experiencer, and temporal status from clinical reports.
ConText: an algorithm for determining negation, experiencer, and temporal status from clinical reports.
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DOI:
10.1016/j.jbi.2009.05.002
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发表时间:
2009-10
影响因子:
4.5
通讯作者:
Chapman WW
中科院分区:
文献类型:
--
作者:
Harkema H;Dowling JN;Thornblade T;Chapman WW
In this paper we describe an algorithm called ConText for determining whether clinical conditions mentioned in clinical reports are negated, hypothetical, historical, or experienced by someone other than the patient. The algorithm infers the status of a condition with regard to these properties from simple lexical clues occurring in the context of the condition. The discussion and evaluation of the algorithm presented in this paper address the questions of whether a simple surface-based approach which has been shown to work well for negation can be successfully transferred to other contextual properties of clinical conditions, and to what extent this approach is portable among different clinical report types. In our study we find that ConText obtains reasonable to good performance for negated, historical, and hypothetical conditions across all report types that contain such conditions. Conditions experienced by someone other than the patient are very rarely found in our report set. A comprehensive solution to the problem of determining whether a clinical condition is historical or recent requires knowledge above and beyond the surface clues picked up by ConText.
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DOI:
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发表时间:
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影响因子:
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