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Formal representation of complex SNOMED CT expressions
Stefan Schulz1, Kornél Markó, Boontawee Suntisrivaraporn
1Institute of Medical Biometry and Medical Informatics, University Medical Center, Freiburg, Germany. stschulz@uni-freiburg.de
BMC Medical Informatics and Decision Making
|November 26, 2008
Summary
Formal ontology analysis reveals SNOMED CT
Area of Science:
- Medical Informatics
- Ontology Engineering
- Clinical Terminology
Background:
- Definitional expressions for clinical concepts are crucial for ontologically sound reference terminologies.
- SNOMED CT aims for formal reasoning using description logic-based concept definitions.
Purpose of the Study:
- To analyze complex SNOMED CT concepts using formal ontology criteria.
- To evaluate the expressiveness of description logic EL for SNOMED CT definitions.
Main Methods:
- Analysis of complex SNOMED CT concepts like "Concussion of Brain with(out) Loss of Consciousness".
- Application of full first-order logic and description logic EL for concept analysis.
Main Results:
- Complex SNOMED CT concepts, including negations, are expressible in first-order logic.
- Description logic EL has limitations in properly expressing negations within SNOMED CT.
- Temporal scope in SNOMED CT concepts can lead to ambiguous interpretations due to unstated contextual determinants.
Conclusions:
- Complex medical event descriptions in SNOMED CT can be ambiguous.
- Representing negative statements in SNOMED CT requires extensions or reification, as standard EL is insufficient.
- Interpreting SNOMED CT context model concepts as description logic axioms is not recommended due to potential unintended models.
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