DICOM News

DICOM News

January 2019 wg06chairs@dicomstandard.org
...

Current progress is shown below from the most recent meeting of the DICOM Base Standard (WG-06).

WG-06 meets five times a year to do technical review and harmonization of the output from the 32 DICOM Working Groups.

These DICOM supplements add new "chapters" to the standard and the grouped DICOM change proposals, called CPacks, contain minor tweaks or bug fixes.



Web Services
Re-Documentation

Sup 183 80% (after Letter Ballot)


Supplement 183 re-documents PS3.18 Web Services.

The goals of this re-documentation are:

  • Factor out text that is common to multiple services and in doing so 1) ensure uniformity and 2) make clearer and concise for readers.
  • Use a uniform format and style for documenting DICOM web services, making it easier to navigate and more efficient for readers implementing multiple services
  • Bring the Standard into conformance with current Web Standards, especially [RFC7230 - 7234], and [RFC3986 - 3987].
  • Use the Augmented Backus-Naur Form (ABNF) defined in [RFC5234] and [RFC7405] to specify the syntax of request and response messages.
  • Use consistent terminology throughout the Standard.
  • Use a consistent format for documenting services and transactions.

The most important aspect of the re-documentation is that technical requirements of PS3.18 should not be changed. Errors, ambiguities, and underspecified aspects of the current PS3.18 have been corrected through the CP process prior to the finalization of this supplement.

One of the main focus points was all the feedback from the Letter Ballot process.

The DICOMWEB re-doc supplement will be further presented and discussed with the Base Working Group in a coming meeting before Final Text voting.

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2nd gen. RT
C-Arm Radiations

Sup 175 80% (Letter Ballot)


Supplement 175 introduces RT Radiation IODs and RT Radiation Set IODs. A Radiation Set IOD defines a Radiotherapy Treatment Fraction as a collection of instances of RT Radiation IODs. RT Radiation IODs represent different treatment modalities. This Supplement introduces the representation of the C-Arm techniques.

General Architectural Principles

  • Different types of data are encoded in different IODs. This is in contrast to First Generation objects, where different types of data are encoded in a single IOD, such as RT Plan.
  • The new IODs are designed to support all current treatment modalities and be extensible for future modalities and new equipment.
  • Compatibility with First-Generation IODs: It will be possible for the content of First Generation IODs to be represented in Second Generation IODs. However, information beyond the content of a First Generation SOP Instance will be needed to create a valid Second Generation SOP Instance.
  • IODs specific to use cases: Explicit separate IODs have been developed for specific treatment modalities with the concept of RT Radiation IOD - for example, Tomotherapeutic treatments, C-Arm beams, Robotic beams are modeled separately. This allows more stringent conditions to be applied to the presence or absence of Attributes within those IODs, and thereby increases the potential for interoperability.
  • Treatment techniques already in use but not yet covered in First Generation (such as robotic therapy and tomotherapy) have been taken into account.

There were a detailed discussion on different frame of references in RT. Especially discussed were Equipment frame of reference in conjunction with "well known frame of reference" and coordinate systems.

The C-Arms Radiation supplement was voted ready to be sent out for Letter Ballot commenting and voting.

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Realtime
Video

Sup 202 70% (before Letter Ballot)


Supplement 202 describes several new DICOM IODs and associated transfer syntaxes for the transport of real-time video, and/or audio, and associated medical data. These are referred to collectively as DICOM Real-Time Video (DICOM-RTV). The supplement defines an new IP-based DICOM Service for the broadcasting of real-time video to subscribers with a quality of service which is compatible with the communication inside the operating room (OR).

The new Real-Time Video Service supports interoperable devices inside the OR and beyond, enabling a better management of imaging information, impacting directly the quality of care.

SMPTE ST 2110 suite, elaborated on the basis of Technical Recommendation TR03 originated by the VSF (Video Services Forum), is used as a platform. DICOM is defining a mechanism to convey specific medical metadata along with the video in compliance with SMPTE ST 2110-10 which specifies the communication architecture.

DICOM-RTV restricts real-time communication to uncompressed video, since the underlying standards (SMPTE ST 2110 family) do not include any transport of compressed video yet.

The supplement does not define how the video will be stored or re-played. Only the method for feeding the recorder with the synchronized videos and associated metadata is specified by this supplement.

Security aspects are out of scope of this supplement. Common security solutions (e.g., IPSEC, VLAN mechanisms) work with the proposed specification.

One key topic in the review of the document was regarding functional group macros: How to decide on per frame attributes versus functional group macro for this supplement's different attribute collections.

Supplement 202 will be further presented and discussed with the Base Working Group in a coming meeting before Letter Ballot voting.

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DICOMWEB
Retrieve via zip

Sup 211 30% (before Public Comment)


Supplement 211 adds application/zip as an option in the DICOMweb WADO-RS specification, to retrieve an entire DICOM study or series as a single compressed packaged file.

The primary use case is to enable researchers in analytics / machine learning users of DICOMweb who want to retrieve studies / series / collections of images for training purposes. DICOMweb currently provides a means to retrieve an entire study or an entire series using a multipart/related content type, but this requires special non-browser implementations to retrieve the content (multipart/related is not supported by any browsers; it would require special programmatic interventions).

It also provides the objects separately (as opposed to a bundle) making them more difficult to work with on disk / importing into their machine learning tooling as they are streamed into individual files.

A secondary use case is for consumer use of DICOM objects, as providing a ZIP file of DICOM content to a patient or caregiver is more familiar than providing them with a multipart/related response to be programmatically interpreted.

Among different possible approaches, the discussion touched upon pros and cons using "sub resources" versus "acceptance headers" and if DICOMDIR should be mandatory or optional.

Supplement 211 will be further presented and discussed with the Base Working Group in a coming meeting before Public Comment voting.

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XA
Protocols

Sup 212 20% (First presentation)


This supplement adds XA acquisition protocol storage and retrieval.

Use cases include:

  • Centralized edit of protocols and distribution to other systems of same model.
  • Distribution of best practice protocols and general/specific protocols to maintain consistency in clinical trials.
  • Store the protocol(s) used for a particular study, to repeat or perform comparable follow-up, and access to more detailed information about the acquisition protocol used.

Export defined protocols from devices to a central repository to facilitate management of consistency and dose.

Refer to [NEMA XR-27] "X-ray Equipment for Interventional Procedures User Quality Control Mode".

Supplement 212 will be further presented and discussed with the Base Working Group in a coming meeting before Public Comment voting.

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2nd gen. RT
Enhanced RT Image

Sup 213 10% (First presentation)


This supplement adds the Enhanced RT Image to the DICOM standard. Preliminary planned modules include:

  • Image Pixel
  • Multi-frame Functional Groups
  • Multi-frame Functional Dimensions
  • Synchronization Modules
  • Enhanced RT Image

It's aligned with the 2nd gereration Radio Therapy architecture laid out in Supplement 147 and 175.

Supplement 213 will be further presented and discussed with the Base Working Group in a coming meeting before Public Comment voting.

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CPack 99

WG-06 approved Final Text in January 2019.
Now part of the DICOM standard.
1626 Correct Attribute Types in Text Style 1674 Add Dermatology Anatomic Site Context Group and NYU Numbering System Coding Scheme 1714 Add last release to PS 3.6 Data Dictionary 1736 Add Visible Light Photography Attributes corresponding to EXIF 2.31 1764 More quantitative image features 1779 Update AIM to DICOM SR TID 1500 mapping with model revisions 1793 Harmonize the description of the DICOM Communication Model across the parts 1797 Update definition of SOP Class, inclusion of Media Storage Service and Web Services 1807 Corrections of Performed Storage Module 1810 Make the sections on definitions consistent and complete 1811 Key measurements in Encapsulated PDF 1812 Add hints and warnings for intraocular lens calculations to Intraocular Lens Calculations IOD 1813 Add concept of Toric Intraocular Lenses to Intraocular Lens Calculations IOD 1814 Add corneal measurement values sequence to Intraocular Lens Calculations IOD (IOL) 1815 Add new Intraocular Lens Formulas and Lens Constants to DICOM Content Mapping Resource 1816 Update JPEG-LS and RLE Media Types for web services to use registered rather than experimental media types 1817 Replace uses of "data set" that do not refer to the PS3.5 defined meaning 1818 Large compressed images may have more frames than fit in the Basic Offset Table 1819 Add 64 bit binary VRs 1820 InConcatenationTotalNumber must be greater than one if present 1821 AcquisitionDuration need not be mandatory for WSI 1822 Remove Dimension Index Sequence requirement for WSI when Dimensions implicitly defined by TILED_FULL 1823 Add more PET Radiopharmaceuticals for Tau 1824 Add more PMSA Targeting Radiopharmaceuticals 1825 Decision result context groups should not be extensible 1826 Specimen De-identification 1827 Correct code meaning for Formalin 1828 Add Barcode Value to Modality Worklist for WSI 1829 Clarify what slide label images contain and add overview image type 1830 Use of Segmentation and Parametric Maps with Whole Slide Imaging 1833 CP 1304 accidentally introduced restriction on PS format for MPEG-2 1834 Add RT Dose Measurement Devices to CID 7193 1836 Remove instance attributes from QIDO series include all 1837 Add Reason For Visit 1838 Additions to Breast Imaging Report 1840 Make Code Meaning for Bilateral consistent

CPack 100

Current set for March 2019 Final Text.
Currently undergoing Letter Ballot approval.

CPack 101 candidates

Current candidates for Final Text in June 2019


Clicking on one specific Change Proposal above will open the actual content.