DCMDSM: a DICOM decomposed storage model |
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Authors: | Alexandre Savaris Theo H?rder Aldo von Wangenheim |
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Institution: | 1.Department of Computer Science–AG DBIS, University of Kaiserslautern, Kaiserslautern, Germany;2.Department of Informatics, Federal University of Paraná, Curitiba, Paraná, Brazil;3.National Institute for Digital Convergence, Florianópolis, Santa Catarina, Brazil |
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Abstract: | ObjectiveTo design, build, and evaluate a storage model able to manage heterogeneous digital imaging and communications in medicine (DICOM) images. The model must be simple, but flexible enough to accommodate variable content without structural modifications; must be effective on answering query/retrieval operations according to the DICOM standard; and must provide performance gains on querying/retrieving content to justify its adoption by image-related projects.MethodsThe proposal adapts the original decomposed storage model, incorporating structural and organizational characteristics present in DICOM image files. Tag values are stored according to their data types/domains, in a schema built on top of a standard relational database management system (RDBMS). Evaluation includes storing heterogeneous DICOM images, querying metadata using a variable number of predicates, and retrieving full-content images for different hierarchical levels.Results and discussionWhen compared to a well established DICOM image archive, the proposal is 0.6–7.2 times slower in storing content; however, in querying individual tags, it is about 48.0% faster. In querying groups of tags, DICOM decomposed storage model (DCMDSM) is outperformed in scenarios with a large number of tags and low selectivity (being 66.5% slower); however, when the number of tags is balanced with better selectivity predicates, the performance gains are up to 79.1%. In executing full-content retrieval, in turn, the proposal is about 48.3% faster.ConclusionsDCMDSM is a model built for the storage of heterogeneous DICOM content, based on a straightforward database design. The results obtained through its evaluation attest its suitability as a storage layer for projects where DICOM images are stored once, and queried/retrieved whenever necessary. |
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Keywords: | Information Storage and Retrieval Database Management Systems Decomposed Storage Model Digital Imaging and Communications in Medicine |
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