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DICOM N-Dimensional Presentation State Description and Call for Participation

DICOM N-Dimensional Presentation State Description and Call for Participation. Joe Luszcz. Philips Ultrasound. January 4, 2011. What is Presentation State?. A “recipe” describing a particular presentation (display) of a data object.

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DICOM N-Dimensional Presentation State Description and Call for Participation

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  1. DICOM N-Dimensional Presentation StateDescription and Call for Participation Joe Luszcz Philips Ultrasound January 4, 2011

  2. What is Presentation State? • A “recipe” describing a particular presentation (display) of a data object. • According to DICOM, 2D Presentation State includes capabilities for specifying: • the output grayscale space in P-Values • the color output space as PCS-Values • grayscale contrast transformations including modality, VOI and presentation LUT • mask subtraction for multi-frame grayscale images • selection of the area of the image to display and whether to rotate or flip it • image and display relative annotations, including graphics, text and overlays • the blending of two image sets into a single presentation

  3. 2D Example:Blending Presentation State Pipeline

  4. Application of Presentation State • Data objects may contain certain attributes as a “default Presentation State” • A separate Presentation State object referencing the data object overrides the default presentation state attributes within the referenced data object

  5. Enhanced DICOM Objects change the game • Many modalities have created “Enhanced” data objects which allow the specification of 3D and 4D data sets (MR, CT, XA, PET, US, …) • These 3D/4D datasets may be presented (viewed) as • A collection of spatially-related frames • Displayed one at a time, as in a light box display • Sequentially, in “fly-through” display • A Multi-Planar Reformatting (MPR) view, which is a derived slice obliquely through the volume dataset • Volume Rendering, which is a view of the volume dataset from a specified viewport and orientation

  6. Example: Ultrasound Display3 MPR + Volume Rendering Views

  7. 3D Workflow • These derived views may be exchanged as 2D objects linked to the source volume data objects • Need a way to represent the “recipe” for creating these 2D views of volume data objects so the viewing operation may be replicated on a different system and/or at a different time

  8. Example 3D Image Review Workflow • Clinician reviews a 2D derived view on a PACS • Decides to reposition the slice or viewport or change processing • 2D object links to the Presentation State object, which provides the recipe and a link to the source volume data • Workstation uses the recipe to regenerate the same 2D view • Clinician uses workstation controls to modify presentation parameters starting from the same point as the original 2D view

  9. What’s happening withinDICOM working groups • Working Group 11 (Presentation State) has a work item to create a general (not modality specific) n-Dimensional Presentation State object • Working Groups 2 (X-Ray Angiography) and 12 (Ultrasound) are collaborating • Need to understand use cases and requirements for all DICOM imaging modalities • Other imaging modalities need to participate if they want a say in the creation of nD PS objects

  10. Ultrasound Requirements for nD Presentation State • Display layout • Intensity settings • Cropping and sculpting • Scaling • Slicing (MPR) • Rendering • Enhanced Blending Pipeline (sup43) • Text and Graphic Annotation • Identification of Anatomic Views

  11. Toshiba’s nD Presentation State Requirements • Annotations • Segmentation • LUT • MPR • Curvilinear Reformat • Volume Rendering • Synchronization

  12. Standardization Challenges • Distinguishing open-system capabilities from proprietary • Open: MPR plane position/orientation, Render viewport • Proprietary: Certain rendering or edge enhancement algorithms • Maximizing similarity of source and review presentations without disclosing trade secrets • Maximizing commonality while recognizing unique modality features

  13. Standardization Challenges

  14. Call for Participation • In the best interest of vendors and clinicians for all modalities to participate • Desired minimum level of participation • Use Cases • Requirements • Test Cases • Better • Participate in Derivation of the Standard

  15. References • DICOM ps3.4 Annex N: Softcopy Presentation State (2D only) • Toshiba White Paper “Volumetric Data Elements”, 17 May 2010 • Ultrasound White Paper “Ultrasound nD Presentation State Requirements”, 4 Aug 2010

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