First Read of 3D UltrasoundSupplement 43

Working Group 12Ultrasound (3D)

Joe Luszcz, Chair Pro Tem

January 25, 2007 Supp 43 First Read 2

WG-12 (3D) Membership

Vendors EBM Technologies GE Philips Siemens

Clinical AIUM / ISUOG ASE

January 25, 2007 Supp 43 First Read 3

Goal of Supplement 43

Storage of3D Ultrasound Volume Datasets,

2D views derived from them,and related information

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Ultrasound 3D Image Types

Cartesian Volume

Set of 2D FramesSpatially-related

frames

MPR View

3D Volume Dataset

MPR views with 3D P.S.

Frames for Direct Viewing

Export of Volume Dataset

RenderedView

Volume Renderings with 3D P.S.

ProcessedLine Data

Volume Slicing

Volume Rendering

Legend

2D image types

3D volume data

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Unique Qualities of US Operator-dependent interactive acquisition Separate data types in each acquisition plane Non-image data types acquired with image Lack of a fixed frame of reference Different probe geometries and oblique

acquisition planes Real-time imaging at relatively high rates

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3D Ultrasound Use Cases 1

Data-related cases 3D Volume Data

Static and Dynamic Volume Datasets [1,2] Suitable for rendering and slicing [3,4] Volume calibration [5]

2D views derived from Volume Data [6,7,8] Static and Dynamic varieties [9] Calibrated frame data [10]

Separation of Data Types [11] Integrated physio waveforms with image [12]

January 25, 2007 Supp 43 First Read 7

3D Ultrasound Use Cases 2

Workflow-related cases Permit Two-Step Review [13] Frame of Reference

Frame and Probe-relative FoR Patient-relative FoR [14,15] Anatomical FoR (Fiducials) [16]

3D Presentation State [17,18,19] Key Image identification [20] 3D spatial coordinates in SR [21]

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Supplement 43 Concepts

3D Volume Dataset represented by Enhanced US IOD

Companion Physiological Waveform IOD for related physio waveforms

Derived 2D images represented by Ultrasound Image IOD’s with backwards-compatible optional attributes

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Why use existing US IOD’s?

Ease the transition for 3D ultrasound images on legacy PACS

Provide separate SOP Classes for two-stage query/retrieval

Maintain images with integrated data types for direct presentation on viewers

Defer the work of generalizing Enhanced US for 2D images

January 25, 2007 Supp 43 First Read 10

Approaches Rejected Supplement 63 Use of CP-337 approach for volume datasets Use of Enhanced US IOD as 2D replacement Oblique volume datasets (oblique views

relegated to US-MF IOD) Attempts to standardize rendering and

slicing algorithms (may differ in appearance)

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Questions for WG-6 Caution note for calibration of 3D

Render views?

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WG-12 (3D) Next Steps Respond to WG-6 comments by

March Prototype Implementations by mid-

year Assessing interest in public

demonstration Goal: Public Comment in August

Backup Slides

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US Frames of Reference

Ref Plane

Origin

Gantry

Transducer

Patient

Gantry -> TransducerFrame of Reference

Patient -> GantryFrame of Reference

Image Position (Equipment)Image Orientation (Equipment)

Image Position (Patient)Image Orientation (Patient)

Implied byPatient -> Gantry -> Transducer -> Image

Image Plane