The Basic Structure of DICOM

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Transcript of The Basic Structure of DICOM

GE Medical Systems

The Basic Structure of DICOMCharles Parisot, GE Medical Systems

SSRPM Course Neuchtel June 2003C. Parisot

1

The Structure of DICOM

DICOM...Is a GLOBAL STANDARD of Communication, developed under joint efforts by ACR (American College of Radiology) NEMA (National Electrical Manufacturers Assoc.) ESC (European Society of Cardiology) ACC (American College of Cardiology) SFR (Socit Franaise de Radiology) DRG (Deutschen Rntgengesellschaft) AAO (American Academy of Ophthalmology) AAD (American Academy of Dermatology) CAP (College of American Pathology) JIRA (Japaneese Radiology Vendors Association) COCIR (European Radiology Vendors Association) And 25 plus vendorsC. Parisot

2

The Structure of DICOM

DICOM 3.0 approved October 93 20 Vendors at the 93 DICOM RSNA Demonstration 40 Vendors at the 94 and '95 DICOM RSNA Demonstrations More than 100 Vendors at RSNA 96

Since 1997 Too many to count !C. Parisot

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The Structure of DICOM

DICOM documents updated yearlyDICOM 2003 is a compatible extension of DICOM 2001 + 27 Clarifications/Changes + 3 SupplementsAvailable from Global Engineering Documents:

http://global.ihs.com

or

Free on the web : http://medical.nema.org/dicom.htmlDICOM 3.0, DICOM 96, DICOM 98, DICOM 99, DICOM 2000, DICOM 2001, DICOM 2003 are only document publishing names.

This has no direct impact on existing Product Conformance !C. Parisot

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The Structure of DICOM

The 4 dimensions of DICOMDICOM for Image Management DICOM for Network Image Transfer DICOM for Network Printing

IMAGE IMAGING MANAGEMENT QUERY RETRIEVE

IMAGE INFORMATION OBJECTS HARD COPY PRINTING STORAGE

Networking Support, e.g.. TCP/IP

and ...C. Parisot

DICOM for Media Interchange/Archiving5The Structure of DICOM

Dimensions #1

DICOM for Image TransferIMAGE QUERY RETRIEVE STORAGE IMAGE INFORMATION OBJECTS

Networking Support, e.g.. TCP/IP

Understanding Image transfer with DICOM ...C. Parisot

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The Structure of DICOM

DICOM Spans Most of Medical Imaging INFORMATION OBJECTS

1993 1995 1996 1997

CT, MR, CR CT, MR, Second. Capt. (SC) X-Ray Cardio/Vasc Cardio/Vasc X-Ray Fluoro US NM PET RT X-Ray Digital RAD X-Ray Digital Mammo X-ray Intra-Oral IntraStored Print Pathology, Optalmo. Optalmo. Vaweform Structured ReportingThe Structure of DICOM

IMAGE QUERY RETRIEVE STORAGE

1998 1999 20017

DICOM runs on Internet and Networking Support TCP/IP IntranetC. Parisot

2003 Advanced MR, Advanced CT, .. MR,

DICOM Spans Most of Medical ImagingDICOM transfers not only Images, but also:- Therapy Plans, Structures, etc. - Waveforms - Structured Reports

1993 1995 1996 1997 1998 1999 20018

CT, MR, CR CT, MR, Second. Capt. (SC) X-Ray Cardio/Vasc Cardio/Vasc X-Ray Fluoro US NM PET RT X-Ray Digital RAD X-Ray Digital Mammo X-ray Intra-Oral IntraStored Print Pathology, Optalmo. Optalmo. Vaweform Structured ReportingThe Structure of DICOM

DICOM transfers not only Radiology images, but also:- Cardiology (X-Ray Angio, US, NM) - Oncology (RT Portal images) - Dentistery (X-ray Intra-Oral) - Pathology, Endoscopy, Microscopy, Optalmology, etc.

2003 Advanced MR, Advanced CT, .. MR,C. Parisot

What can I really do with DICOM TODAY ? Build simple and easy-to-implement networks Reap efficiency and productivity benefits Invest in a necessary step for future PACS

C. Parisot

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The Structure of DICOM

Simple Networks in Radiology and TeleradiologyCT, MR, NM, US, Digitizer, CR, digital X-ray, PET XCT, MR, NM, US, Digitizer, CR, digital X-ray, PET XLocal Area NetworkImaging Equipment

DICOM SERVICES USED

Imaging Equipment

DICOM STORAGE QUERY/RETRIEVEISDN Link or Dial-Up DialAnalysis or Review Workstation

DICOM STORAGE

DICOM STORAGERemote Workstation

A DICOM Network, todays common foundation both inside Radiology and for Teleradiology

C. Parisot

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The Structure of DICOM

Networks in Radiology and Care Units with Cluster ArchivingCT, MR, NM, US, Digitizer, CR, digital X-ray XImaging Equipment Local Area Network

CT, MR, NM, US, Digitizer, CR, digital X-ray XImaging Equipment

DICOM SERVICES USED

DICOM STORAGECluster Archive

DICOM STORAGE

Cluster Archive

ISDN Link or Dial-Up Dial-

DICOM QUERY/RETRIEVE DICOM STORAGEAnalysis or Review Workstation

Care UnitAnalysis or Review Workstation

Remote WS

DICOM STORAGE

A DICOM Network is the common foundation both inside Radiology and for TeleradiologyC. Parisot

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The Structure of DICOM

What should I do to build a DICOM Image Transfer Network ?Three Steps:1 - Clarify my Clinical Needs for Image Transfer and Image processing Applications 2 - Match Those Needs with DICOM Service Classes using the DICOM Conformance Statements 3 - Validate the Imaging Application Interoperability

C. Parisot

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The Structure of DICOM

Step 2-Compare DICOM Conformance StatementsCT Scanner Conformance Statement Workstation Conformance Statement

1-CT STORAGE SCU 2-QUERY SCP 3-RETRIEVE SCP 4-MODALITY WORKLIST SCUSCU = Service Class USER SCP = Service Class PROVIDER

1-CT STORAGE SCP 2-QUERY SCU 3-RETRIEVE SCU 4-MR STORAGE SCP 5- BASIC PRINT SCU

Matching DICOM Service Classes The necessary step to find what will workC. Parisot

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The Structure of DICOM

DICOM: Service-Object PairExample: CT Image Storage Service: StoreGeneric Sentence:

Object: CT Image

SOP Class " Store CT Image "

Unique ID: 1.2.840.10008.5.1.4.1.1.2

SOP Instance "" Store this CT Image " SOP Instance Store this CT Image " " SOP Instance "" Store this CT Image " SOP Instance Store this CT Image " SOP Instance "" Store this CT Image " SOP Instance Store this CT Image Specific Sentence (SOP Instance): Absolutely unique instance !Unique ID: 1.2.840.113619.3.23.1584567.4465.123.19.2C. Parisot

14

The Structure of DICOM

In practice, how does it work...Association EstablishmentImage SourceServices offered (SOP Classes UID) and associated coding (Transfer Syntaxes UID)

Image ServerUser of the Storage Service C-Store Request Sending of a message with header + pixels according to one of the accepted transfer syntaxes C-Store Response Success / Failed C-Store Request C-Store Response

Provider of the Storage Service

C. Parisot

15

The Structure of DICOM

Image Information Object Definitions (IOD)Patient Information Study InformationPatient Module

Patients Name Patients ID Patients Birth Date Patients Sex Patients Weight* Referring Physicians Name Accession Number Study Instance UID

General Patient Study Study Module Module* Frame of General General Series Reference Equipment Series Information Module Module Module Image Image Contrast/ General Image Plane Pixel Bolus Image Information Module Module Module Module VOI Overlay Image SOP LUT Plane Module Common Module* Module Module*

Not only contains pixel data but also key information about the imageC. Parisot

16

The Structure of DICOM

DICOM EncodingMessage = Data SetData Data Data Data Element Element Element ElementSender

... ... ...Receiver

Tag

VR

Value Length

Value Field

Optional Field: Value Representation Dependent on Transfer Syntax Unique tag defined in DICOM Data DictionaryC. Parisot

17

The Structure of DICOM

Great, So it will simply Plug and Play ?Do not Forget Step 3 !1 - Clarify my Clinical Needs for Image Transfer and Image processing Applications 2 - Match Those Needs with DICOM Service Classes using the DICOM Conformance Statements

3 - Validate the Imaging Application Interoperability

C. Parisot

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The Structure of DICOM

Step 3 - Application Interoperability(1)CT Scanner Conformance Statement CT Object Implementation 3D Application Conformance Statement CT Object Requirements

Private Attributes

Optional Attributes REQUIRED DICOM Attributes Application required DICOM Attributes

DICOM Addresses Plug and Play Only for Applications with Basic Information RequirementsC. Parisot

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The Structure of DICOM

Step 3 - Application Interoperability(2)MR Scanner Conformance Statement MR Image Object Implementation Image Filtering Application Conformance Statement MR Object RequirementsPrivate Attributes

REQUIRED DICOM Attributes

Application required DICOM Attributes

Applications with Complex Information Requirements May not be Plug and PlayC. Parisot

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The Structure of DICOM

Step 3 - Application Interoperability(3) To Maximize Application Interoperability

Optional Attributes REQUIRED DICOM Attributes Modalities Should Support all Applicable Optional AttributesC. Parisot

Application required DICOM Attributes Applications Should Avoid Use of Optional Attributes21The Structure of DICOM

So What Should Be Done ?1 - Fix the Standard ? No, The Standard has to strike the proper balance between: Plug and Play Variety of Modality and Applications Innovation and Need for New Attributes

==> Document in the Conformance Statements Attributes Support2 - Application Interoperability can Be Maximized (Previous Slide)

==> Select Products With Good Design.3 - In the (few) Cases Imaging Application Use Complex Attributes:

==> Interoperability Should be Carefully Analyzed (Conformance Statements) and Validated in Clinical Environment.C. Pa