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UML Modeling and XML Representation of DICOM SR

UML Modeling and XML Representation of DICOM SR. Jingkun Hu , KP Lee, Doug Sluis, Alfredo Tirado-Ramos June 8, 2001. Outline. Why UML modeling Modeling processes Why XML XML DTD SR XML documents and their validation Conclusions. Why UML Modeling.

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UML Modeling and XML Representation of DICOM SR

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  1. UML Modeling and XML Representation of DICOM SR Jingkun Hu, KP Lee, Doug Sluis, Alfredo Tirado-Ramos June 8, 2001

  2. Outline • Why UML modeling • Modeling processes • Why XML • XML DTD • SR XML documents and their validation • Conclusions

  3. Why UML Modeling • Help to understand DICOM SR information model • Bridge from DICOM to non-DICOM world, e. g., HL7 CDA. • Bridge from entity-relationship (E-R) tables to XML DTDs or schemas

  4. UML Modeling Processes • DICOM IOD is mapped to class • Each IE is mapped to a class • Each Module is mapped to a class • Each Macro is mapped to a class • All attributes, Macros, and sequences under a sequence are mapped to the members of a class.

  5. UML Modeling Processes (Cont) • Naming rules for a class • Capitalize the first letter of a single word • Remove the white space • Naming rules for an attribute • change all the upper case letters to lower case • replace the blank space between two words with an underscore • remove apostrophes and brackets • replace hyphen (-) and slash (/ or \) with an underscore.

  6. UML Modeling Processes (Cont) • Usage • M (mandatory) : required • U (user defined) : optional • Type • Type 1 and type 2 : required • Type 1C, Type 2C, and Type 3: optional

  7. UML Modeling Processes (Cont) • VRs (value representation)

  8. Modeling Results • Comprehensive SR IOD • Patient IE • Study IE • Series IE • Equipment IE • Document IE • Complete Model for Comprehensive SR IOD

  9. Limitations Cannot represent: • Conditions • Tag information: e. g., tag, VR • Rich DICOM VRs: different types of string • The number of items within a sequence

  10. Why XML • Web browser is the most popular viewer • XML is web supported • XML defines a universal exchange format

  11. XML DTD for DICOM SR • Generate automatically with XML toolkit • It is almost unreadable • Generate manually with XML Authority toolkit together with the UML model • Added detailed DICOM tag information, e.g., tag, type, and meaning, as attributes

  12. SR XML DTD • The complete SR XML DTD • A sample SR XML document based on this DTD and content of an SR specification • Document validation

  13. Limitations • Cannot represent attribute information such as tag, usage, value representation • Cannot represent constraints conditions • Demonstration What’s the solution to it? An answer is XML Schema

  14. SR XML Schema • Work in Progress • SR XML schemas • Automatic generation of Schema from Spec.

  15. Conclusions • SR UML class models ease understanding of DICOM SR • SR XML DTDs can represent DICOM SR structure clearly • DTD cannot represent rich DICOM VRs and constraints • Current approach: XML Schemas

  16. Q & A Thankyou!

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