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Consistent Presentation of Images Integration Profile

Consistent Presentation of Images Integration Profile. Charles Parisot GE Medical Systems IT Planning and Technical Radiology Committees. Scheduled Workflow. Patient Informa-tion Reconci-liation. Charge Posting. Presentation of Grouped Procedures. Reporting Workflow.

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Consistent Presentation of Images Integration Profile

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  1. Consistent Presentation of ImagesIntegration Profile Charles Parisot GE Medical Systems IT Planning andTechnical Radiology Committees

  2. Scheduled Workflow Patient Informa-tion Reconci-liation Charge Posting Presentation of Grouped Procedures Reporting Workflow Post-Processing Workflow , Simple Image and Numeric Reports Consistent Presentation of Images Evidence Documents Key Image Notes IHE Integration profiles - Access to Radiology Information Basic Security April 2003 Workshop

  3. The Grayscale Consistency Problem: • The appearance of grayscale images displayed on different types of softcopy display devices or printed on different types of hardcopy output devices is in generalinconsistent and at times may impact clinical perception April 2003 Workshop

  4. Problems of Inconsistency VOI chosen on one display device Rendered on another with different display Mass expected to be seen is no longer seen mass visible mass invisible Slide Provided by David Clunie April 2003 Workshop

  5. Problems of Inconsistency 0.5 1.0 Not all display levelsare perceivable on alldevices 1.5 3.0 Slide Provided by David Clunie April 2003 Workshop

  6. Problems of Inconsistency 0.5 1.0 Not all display levelsare perceivable on alldevices 1.5 3.0 Slide Provided by David Clunie April 2003 Workshop

  7. Digital Modality Laser Printer Problems of Inconsistency Printed images don’t looklike displayed images Slide Provided by David Clunie April 2003 Workshop

  8. Causes of Inconsistency Display devicesvary in the maximumluminance they canproduce Display CRT vs. film on a light box is an extreme example 1.0 .66 Slide Provided by David Clunie April 2003 Workshop

  9. Consistent Presentation of Images IHE Objectives Consistent distribution of Images across the healthcareenterprise : • Consistency among Hardcopy Images Printed on different Printers (from different Vendors). • Consistency among Softcopy Images view on different display devices (from different Vendors). • Consistency among Hardcopy and Softcopy Image view The cost effective solution to ensure that image quality is maintained acrossdifferentmonitors and film producing devices. April 2003 Workshop

  10. Consistent Presentation of Images Requires: • Calibration of the Softcopy Display and the Hardcopy Output Devices using DICOM Grayscale Standard Display Function • Creating Hardcopy Output Using DICOM Basic Print with Presentation LUT Support • Preserving/Using the Softcopy Display Viewing Parameters in the DICOM Grayscale Softcopy Presentation State Cal Hard Soft April 2003 Workshop

  11. Achieve Grayscale Consistency in Hardcopy Output and Softcopy Viewing The DICOM Standard Defines: A standard curve, the Grayscale Standard Display Function (GSDF), against which different types of display and hardcopy output devices should be calibrated Cal Devices Have to Be Properly Calibrated April 2003 Workshop

  12. Cal Grayscale Standard Display Function 1000 Film 100 10 Monitors 1 0 200 400 600 800 1000 .1 .01 JND Index DICOM GSDF preserves thehuman perceptual responsebased on eye contrast sensitivity Mapping of the P-values to theview luminance or optical density value April 2003 Workshop Slide Provided by David Clunie

  13. Cal Grayscale Standard Display Function 1000 100 10 1 0 200 400 600 800 1000 .1 .01 JND Index Perceptual Linearization Despite different change in absolute luminance Same number of Just Noticeable Difference == Same perceived contrast Slide Provided by David Clunie April 2003 Workshop

  14. Cal Printer Calibration Tools (Densitometer) April 2003 Workshop

  15. Cal Display Calibration Tools (Photometer) April 2003 Workshop

  16. Cal Monitor Characteristic Curve Monitor Characteristic Curve 100 10 0.1 Ambient Light 0.01 0 50 100 150 200 250 300 Digital Driving Level Slide Provided by David Clunie April 2003 Workshop

  17. Cal Grayscale Standard Display Function 1000 Maximum Luminance + Ambient Light 100 Monitor’s Capability 10 1 0 200 400 600 800 1000 Minimum Luminance + Ambient Light Jmax == P-Value of 2n-1 .1 Jmin == P-Value of 0 .01 JND Index Standard Display Function Slide Provided by David Clunie April 2003 Workshop

  18. Cal 100 Standard 10 1 0 50 100 150 200 250 Characteristic Curve 0.1 DDL or P-Values Standardizing a Display Slide Provided by David Clunie April 2003 Workshop

  19. To Achieve Consistent Presentation of Images, the DICOM Standard Defines: • Basic Print Management with Presentation Look Up Table, for controlling the consistent appearance of preformatted images on printed output Hard April 2003 Workshop

  20. DICOM Presentation LUT N-CREATE Basic Print Request with Presentation LUT Print Print Composer Server DICOM Film Session N-CREATE Print Composer Print Request Print Presentation LUT DICOM Film Box N-CREATE DICOM Image Box N-SET DICOM Film Box N-ACTION DICOM Film Session N-ACTION Print Server Print Status (DICOM N-EVENT-REPORT) Hard Printer Status April 2003 Workshop

  21. Basic Print Request with Presentation LUT • Print Composer – A system that generates DICOM print requests as a DICOM Print SCU.Print composer has to apply image processing manipulations, and requests to Print server will specify P-Values in the form of a Presentation Look-Up Table (Presentation LUT) or implicitly by Presentation LUT Shape. • Print Server – A system that accepts and processes DICOM print requests as a DICOM Print SCP and performs image rendering on hardcopy media.The system must support pixel rendering to optical density according to the DICOM Grayscale Standard Display Function. Hard April 2003 Workshop

  22. To Achieve Consistent Presentation of Images, the DICOM Standard Defines: Soft Grayscale Softcopy Presentation State (GSPS): an object for storing and communicating the parameters that describe how an image or set of images should be displayed. A GSPS object contains references to the images it applies to, and the transformations (grayscale transformations, shutter transformation, image annotation, spatial transformations, and displayed area annotation) that should be applied when the images are presented on a softcopy display, or printed on film. April 2003 Workshop

  23. Area Of Interest Area Of Interest Achieving Consistent Presentation Flip Zoom Annotate Original Image Without Consistent Presentation Window Level Consistent Presentation of Images Referring Physician or Reviewing Radiologist Reporting Radiologist Soft Presentation State Presentation LUT Grayscale Standard April 2003 Workshop

  24. Rescale Slope/Intercept or Modality LUT Window/Level or VOI LUT Presentation LUT Presentation LUT Transformation Original Image M o d a l i t y M a s k V O I L U T L U T Grayscale Transformations ( S u b t r a c t i o n ) T r a n s f o r m a t i o n T r a n s f o r m a t i o n S h u t t e r P-Values Display T r a n s f o r m a t i o n I m a g e D i s p . A r e a S p a t i a l Shutter, Annotation and Spatial Transformations T r a n s f o r m a t i o n A n n o t a t i o n A n n o t a t i o n DICOM Grayscale Image Transformation Model Soft e April 2003 Workshop

  25. GSPS Stored, and Query/Retrieve GSPS Image Display Image Creator 15 Query Presentation State 19 Creator Presentation Retrieve Presentation State 17 State Stored Image Archive 9 Modality Presentation State Stored Acquisition Modality • IHE Transaction - an Acquisition Modality or Image Creator Actor sends a DICOM GSPS C-STORE request to an Image Archive Actor • IHE Transaction - an Image Display Actor issues a C-FIND request to an Image Manager Actor • IHE Transaction - an Image Display Actor issues a C-MOVE request to an Image Archive Actor Soft April 2003 Workshop

  26. Soft IHE Year 4: Presentation State Specific Query Matching and Return Keys Attribute Name Tag Query Keys Matching Query Keys Return SCU SCP SCU SCP Presentation Label (0070,0080) O O R+ R+ Presentation Description (0070,0081) O O O R+ Presentation Creation Date (0070,0082) O O R+ R+ Presentation Creation Time (0070,0083) O O R+ R+ Presentation Creator’s Name (0070,0084) O O R+ R+ Referenced Series Sequence (0008,1115) O O R+ R+ >Series Instance UID (0020,000E) O O O R+ >Referenced Image Sequence (0008,1140) O O O R+ >>Referenced SOP Class UID (0008,1150) O O O R+ >>Referenced SOP Instance UID (0008,1155) O O O R+ April 2003 Workshop

  27. Consistent Presentation of Images Print Display Acquire Slide Provided by David Clunie April 2003 Workshop

  28. Questions? Documents Available On the Web at: www.rsna.org/IHE April 2003 Workshop

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