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Applying REST to DICOM

Applying REST to DICOM. Chris Hafey Feb 23, 2011. Introduction. Three Types of Web Services RPC Based (WS*) REST REST/RPC Hybrid Pure REST is a great fit for DICOM Simple Wide technology support Many DICOM use cases are CRUDish. Resource Oriented Architecture. Resources URIs

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Applying REST to DICOM

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  1. Applying REST to DICOM Chris Hafey Feb 23, 2011

  2. Introduction • Three Types of Web Services • RPC Based (WS*) • REST • REST/RPC Hybrid • Pure REST is a great fit for DICOM • Simple • Wide technology support • Many DICOM use cases are CRUDish

  3. Resource Oriented Architecture • Resources • URIs • Addressability • Statelessness • Representations • Links and Connectedness • Uniform Interface

  4. Resources • Entities • DICOM Modules • Patient • Study • UID Based • Study, Series, Instance • Internals • Image Frame • Algorithms • Render Image • Search • Complex Transactions • Merge Studies

  5. URIs • Entites • Use path to specify where an entity is • E.g – A study • http://server/study/1.2.3.4.5 • Algorithms • Use Path to specify which algorithm/entity to run • Pass algorithm parameters via http query parameters • E.g. – render a sop instance as a JPEG with a specific window center/window width • http://server/study/1.2.3.4.5/series/1.2.3/instance/1.2.3?windowWidth=400&windowCenter=40 • Transactions • Use path to specify transactions • The transaction resource can point to other entities that will be affected

  6. Addressability • Expose interesting aspects of its data set as resources • Allows data to be used in ways not originally anticipated • E.g. exposing individual DICOM Modules to be independently accessed

  7. Statelessness • Each HTTP Request happens in complete isolation • No “session” • Simplifies error conditions • Can send the same web request multiple times without side effects

  8. Representations • Leverage MIME Types • Application/XML • Application/JSON • Application/DICOM • Image/JPEG • Image/PNG • A resource can be returned in multiple representations

  9. Links and Connectedness • Use HREF to link between resources • DICOM Examples • Patient to Study • Study to Series • Series to Instance • Presentation State to Image • Structured report to Image

  10. Uniform Interface

  11. Reference Books • RESTful Web Services • Leonard Richardson & Sam Ruby • RESTful Web Services Cookbook • SubbuAllamaraju • REST in Practice • Ian Robinson, Jim Webber, and SavasParastatidis

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