Dicom News

October 2013 Bjoern.Nolte@siemens.com

Here are the summary notes from the latest Dicom Working Group 6 Meeting. The progress of all 30 working groups and the state of Dicom supplements (new chapters to the standard) and change proposals (bug fixes in the standard) are reflected.

nD Presentation States

Sup 156 Revisit planned for Jan 2014
Still in concept discussions

The concepts blending and fusion have been added.

A general assumption is that the display device is responsible to choose style instead of having very detailed constraints on style in the standard.

The following results came out of the discussion on views: Each presentation state defines one view for one segment. There is a mechanism for grouping of views. Separate SOP classes for each view type: Planar MPR, Curved MPR and Volume rendering.

The definition of Opacity Control Point was discussed. The input values associated with the curve and the Opacity Control Points are used by the volume rendering algorithm.

The following modules are currently making up the flesh of this supplement:

  • Volumetric Presentation State Identification
  • Volumetric Presentation State Relationship
  • Volume Cropping
  • Clinical Context
  • Multi Planar Reconstruction Geometry
  • Rendering Geometry
  • Render Lighting
  • Volumetric Presentation State Blending
  • Volume Graphic Annotation
  • Graphic Annotation
  • Graphic Layer
  • Presentation Animation
The document is still in the concept discussion.

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Breast Projection XR

Sup 165 Revisit planned for Jan 2014 Approved to go out for Letter Ballot voting (75%)

The detailed text in the detector area paragraph was scrutinized.

The comments which have substantial impact on the supplement were addressed first.

This was especially the major comments from Fuji. They asked why so much information was mandatory in the supplement which is not necessary for the DISPLAY use case. The working group 15's view is to keep the information as it is vital for the FOR PROCESSING use case.

All previous 11 open issues now have a corresponding closed issue.

The text description of ISO center coordinate system has been improved.

A consolidation of three detector coordinate definitions has been simplified down to one detector coordinate system for all.

The supplement is approved to go out for a letter ballot review.

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Sup 166 Risk missing integration with clinical IT
Approved to go into Final Text (100%)

A more preferrable multi-item response format suggested by GE was not accepted by WG6. It can be considered for future changes.

A suggestion to have an alignment with HL7's convention for Person Names was discussed. The decision is not to align in QIDO but to discuss this on a higher level. This will be a task for WG20.

A longer discussion on multi-responses was held. If responses are broken up in a series of responses then the complete series of responses shall have the same order and content as if there was one response. This is only possible and required if the underlying server data is unchanged.

A detailed walk trough of matching and return keys was performed. Notes were added for attributes may be returned empty or not returned at all.

The supplement was voted to go into final text.

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Important warning for PACS products

An informal discussion on RESTful (WADO, QIDO, ...) services took place

With the RESTful services it will be possible to integrate Clinical IT systems which only understand http with the radiology domain.

Further PACS system will further decline as big iron storage vendors will much easily get access to medical applications which are RESTful enabled.

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X-Ray 3D info annex

Sup 167 Revisit planned for Jan 2014 First visit for the working group, still early material

A detailed walk trough of each open issue was done.

A general review of the main concepts was done.

After some discussion the conclusion was to have some guidance to keep the volume in a separate series apart from the 2D slices.

A partial walkthrough of the document was done.

Further changes are planned within the WG2 with a revisit later on in WG6.

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Protocol Storage

Sup 121 Revisit planned for Jan 2014 Approved to go out for Public Comments (50%)

A large new additional input was discussed: New suitable codes from well-known dictionaries and "template like" examples.

Some major vendors have added codes for their important scanners.

The supplement was voted to be ready and to go out for a public comment review.

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Corneal Topology

Sup 168
Approved as Final Text (100%)

If new maps will be added, which is likely, then new SOP class UIDs are necessary instead of modalities.

Working group 6 argued that study description and series description are better to be used for this purpose instead of multiple SOP Class UIDs. After some discussion there was an agreement to move some sections from part 4 to part 3 from the supplement. This will be more in line with the rest of the standard.

Several smaller changes such as typos and better explanations have been added to the newest version of the supplement.

This supplement was voted to go into final text.

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Contrast Inj. SR

Sup 164 Revisit planned for Jan 2014 Close to ready for Public Comment

Also discussed under the name: Substance Administration Report.

A detailed discussion took place on the code names, code meaning and conditions throughout the document.

Many minor updates and changes were done due to the discussion.

The working group will revisit WG6 in January 2014.

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2nd Gen RT

Sup 147 Revisit planned for Jan 2014 Close to ready for Public Comment

Illustrations have been added to explain the concept of UNIONS, NEGATIONS and EXCLUSIONS of conceptual volumes. After a discussion EXCLUSION will be removed and NEGATIONS will be kept. Both are not necessary to describe the volume area of interest.

A discussion to clarify the examples regarding radiation fraction patterns ended with several improvements to the text. In the RT field clinicians think in weeks. Therefor the patterns are all centered round a weekly schedule concept.

A clarifying discussion occurred regarding system and subsystem. A LINAC with one gantry for example is described as one machine and therefor as system A. A system containing one proton source and two separate gantries for example will be coded in the supplement as a system A (the complete system source and gantries together) with the gantries as subsystem A1 and A2.

A detailed discussion took place on the following concepts: Control Points and Metersets. A Control Point describes which parameters (including MU/Time) of the Treatment Unit change during beam delivery. The Meterset is the cumulative radiation progress variable which is checked and verified at control points.

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Chinese DICOM

Risk for foreign vendor complications in China NEMA/DICOM to start talks with Chinese group

In China there is an initiative to standardize how DICOM is to be used for XRay products in China. In this work parts of the DICOM standard is translated to Chinese. Unfortunately this translation is normative for the Chinese market.

Further this government body adds mandatory validation tooling to China's local national standard administration for medical devices (China FDA).

These set of guidance and rules will be mandatory for all vendors on the Chinese market.

The DICOM organization urges the Chinese initiative to not change any semantics of the standard in their efforts. If they feel there is a change necessary, then the normal way with change proposals shall be used. (SAC TC10 SC1)

MITA will have their local consultant in China to push for a vendor neutral national validation tooling.

Display Parameters

Sup 124 Revisit planned for Jan 2014 Ready for Public Comment

Many minor updates and changes were done due to the discussion.

The working group will revisit WG6 in January 2014 to discuss the comments from the Public Comment phase.

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