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Published byElinor Estella Barrett Modified over 9 years ago
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Mpeg-21 and Medical data A strategy for Tomorrow s EMR
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Introduction to Health care Standards $ DICOM $ ACR-NEMA $ Current version3 $ HL-7 $ User consortia V2.4 (v3 next step)
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DICOM- Digital Imaging and Communication in Medicine $ Set of services and protocols to allow communication between imaging devices, whatever they are. $ The DICOM file format is not only an image file format, it also contains patient, study and acquisition related information.
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The Parts of the DICOM Standard $ Part 1 - Introduction and Overview $ Part 2 - Conformance $ Part 3 - Information Object Definitions $ Part 4 - Service Class Definitions $ Part 5 - Data Structures & Semantics $ Part 6 - Data Element Listing and Typing $ Part 7 - Message Exchange Protocol $ Part 8 - Network Support for Message Exchange $ Part 9 - Point-to-Point Support
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The Parts of the DICOM Standard $ Part 10 - Media Storage and File Format $ Part 11 - Media Storage Application Profiles $ Part 12 - Media Formats and Physical Media $ Part 13 - Print Management Point-to- Point
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DICOM Application Domain MAGN ETOM Information Management System Storage, Query/Retrieve, Study Component Query/Retrieve, Patient & Study Management Query/Retrieve Results Management Print Management Media Exchange LiteBox
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Network Protocol
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Summary of DICOM Features $ NETWORK PROTOCOL $ DICOM incorporates negotiation to permit nodes to agree on the functions to be performed $ MESSAGE ENCODING $ DICOM defines 24 data types (V2.0 had 4) $ DICOM message encoding includes JPEG compression (17 variants) $ DICOM includes encapsulated image and multi-frame syntaxes
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Summary of DICOM Features $ OBJECT DATA MODEL $ DICOM is based on a completely specified data model $ DICOM includes a robust UID mechanism $ SERVICE CLASSES $ DICOM defines classes of service for specific applications (e.g. image management, printing) and conformance levels $ Off-Line Media Support $ DICOM defines a directory structure and media profiles $ CONFORMANCE $ DICOM requires conformance statements and contains detailed conformance requirements.
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DICOM Terminology $ DICOM Message Service Element (DIMSE) - The set of DICOM Application Layer communication services. $ DIMSE Service Group (DSG) - A subset of the full DIMSE services which is applicable to a specific IOD. $ Information Object Definition (IOD) - A data abstraction of a class of real-world objects. A collection of related attributes (data elements).
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DICOM Terminology $ Service Class - A set of functionality relating to a single type or real-world activity. Composed of a set of SOP Classes plus rules and associated semantics. $ Service-Object-Pair Class (SOP) - The atomic unit of DICOM functionality. Composed of an IOD and a DIMSE Service Group plus restrictions or extensions of the IOD. (Equivalent to an Object Class)
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Service-Object Pair Class SOP Data Dictionary Real-World Object Information Object DIMSE Service Group
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Example $ Verb : store Service (DIMSE) $ Noun : CT image Information Object Definition (IOD) $ Generic sentence : store a CT image SOP class $ Specific sentence : store this CT image SOP instance
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DICOM Service Classes $ Composite (flow of image data ) $ Verification $ Storage $ Query/Retrieve $ Study Content Notification $ Normalized (management related) $ Patient Management $ Study Management $ Results Management $ Basic Print Management
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DICOM and Mpeg-21 $ Parties are Either Service Class Provider (server) or Server Class User (client) $ MPEG-21 -> Parties are categorized equally as USERS. $ Processing in DICOM is more on a 1-1 basis.
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DICOM and Mpeg-21 $ Both need to have the same SOP Classes $ SOP classes identify the capabilities of the specific distributed processing for a certain service Class $ SOP Instance MPEG-21 Digital Item
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DICOM and Mpeg-21 $ DICOM the context is with medical Images. $ Mpeg-21 ideally is for all multimedia data.
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MPEG-21 Frame work
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DI aware app/browser DICOM AE data Dcm=> DI creator DI(med) Strategy1
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DI aware app/browserl DICOM AE m1.dcm Translator DI ( m1.dcm) Strategy2
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Health Level Seven 14-year-old, not-for-profit organization $ ANSI-accredited standards developer since 1994 $ International affiliates in 17 countries $ Version 2.x Standards are widely used in US and being rapidly adopted world-wide
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HL-7 In healthcare systems it enables electronics communication of text based information between all Institutions and their different departments.
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HL-7 mission To Provide standards for the exchange,management and integration of data that support clinical patient care and the management, delivery and evaluation of healthcare services.
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HL-7 versions $ v2.x features $ Messaging standard $ Event triggered $ V3 $ Reference Information Model $ ALL communications (by default) uses XML
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HL-7 and MPEG-21 Clinical Document Architecture(CDA) $ Similar to DI description Model Clinical documents ¥1 MPEG-21 DI s
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Electronic Health Record(EHR) $ A collection of individual records that reside in a variety of information systems and locations and on multiple types of media. $ A new way of structuring, storing and managing patient data so that it can shared and exchanged between different healthcare providers in safe and secure manner.
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Electronic Medical Record(EMR) Electronic Patient Record(EPR) Electronic Health Record(EHR) MPEG 21 DI s ???
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References $ ACR-NEMA committee http://medical.nema.org/dicom/ Penn state DICOM resources page http://www.xray.hmc.psu.edu/dicom/
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