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Early Implementations of WADO Web Access to DICOM Persistent Objects

ISO TC125 / DICOM San Diego January, 2004. Early Implementations of WADO Web Access to DICOM Persistent Objects. Emmanuel Cordonnier, Bernard Hervault (ETIAM) Koos Rommelse (GEMS-IT) Dave Harvey (Medical Connections) Fred M. Behlen (LAI Technology). Examples of implementation.

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Early Implementations of WADO Web Access to DICOM Persistent Objects

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  1. ISO TC125 / DICOM San Diego January, 2004 Early Implementations of WADOWeb Access to DICOM Persistent Objects Emmanuel Cordonnier, Bernard Hervault (ETIAM) Koos Rommelse (GEMS-IT) Dave Harvey (Medical Connections) Fred M. Behlen (LAI Technology)

  2. Examples of implementation Web Client System Web Access to Dicom Persistent Objects Web Access to Dicom Persistent Objects DirectInterface Web Gateway Gateway DICOM Q/R DICOM Interface Web Interface DICOM Q/R DICOM Interface DICOM Objects Database DICOM Objects Database Flexibility for the client to be implemented either as new system or on existing system ISO TC215 / DICOM WADO San Diego Jan. 2004

  3. Implementation A): retrieval of DICOM images in jpeg format • Proof-of-concept implementation • Windows NT-based host • Microsoft IIS 5.1 WebServer • WADO JPEG functionality added to the Web Extension for the DICOM server product • Images retrieved using Internet Explorer 6.0 running on Windows XP using pre-determined UIDs • Full implementation, including retrieval of images in native DICOM format, likely available in next release of the product ISO TC215 / DICOM WADO San Diego Jan. 2004

  4. A) WADO in Internet Explorer WADO URL JPEG Image ISO TC215 / DICOM WADO San Diego Jan. 2004

  5. Implementation B): WADO Trial • Moderately complete implementation apart non image objects, charset and anonymize params • All images accessed through a WADO gateway: wado.medicalconnections.co.uk/wado/wado.asp?... • Web server and DICOM server on the same machine, but logically completely independent (no direct connections to the DICOM servers tables) • Pre-existing patient root hierarchy for initial navigation, using completely different terms for the UIDs etc., and conveys series and study names etc. alongside. No need for re-engineering the system. ISO TC215 / DICOM WADO San Diego Jan. 2004

  6. B) WADO Trial available on Internet ISO TC215 / DICOM WADO San Diego Jan. 2004

  7. Implementation C): WADO viewer • Server build on Linux, access to DICOM image database through PHP scripts • WADO used for retrieving and displaying images in JPEG (IE 6/5/4, Netscape, …) • Params used: frameNumber, rows, columns, windowCenter, windowWidth, region • Prototype tested: WADO gateway accessing DICOM QnR SCP (retrieve DICOM/JPEG) ISO TC215 / DICOM WADO San Diego Jan. 2004

  8. C) Viewer using WADO ISO TC215 / DICOM WADO San Diego Jan. 2004

  9. Implementation D): SRs & images • Front-end process for Web repository containing DICOM objects. • Implemented using C++ modules in Apache Web server, running on Windows 2000 platform • Supported content-types • Images: • application/dicom • image/jpeg • SR objects: • application/dicom • text/xml ISO TC215 / DICOM WADO San Diego Jan. 2004

  10. D) WADO Implementation diagram ISO TC215 / DICOM WADO San Diego Jan. 2004

  11. D) WADO Gateway for reports ISO TC215 / DICOM WADO San Diego Jan. 2004

  12. Implementations Overview ISO TC215 / DICOM WADO San Diego Jan. 2004

  13. Conclusions • Nearly complete implementations (gw & web int.) • Quick developments on different systems and environments, without any difficulties • Contributed to harmonize http query syntax in the DICOM images web enabled servers • WADO provides essential services for standard image retrieval by SR rendered on browsers. • No apparent impact on web viewer performance • The method for obtaining the (three) UIDs for the images uses proprietary ways • There will be more implementations and tests, and we will find the way to promote it through IHE ISO TC215 / DICOM WADO San Diego Jan. 2004

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