November 2018 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 31 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.

2nd gen. RT
Prescription and
segmentation annotation

Sup 147 100% (Final Text)

This supplement defines transfer SOP classes for physician intent and segment annotations for a new generation of radiotherapy (RT) objects.

This supplement lays out the foundation for additional supplements covering all the necessary new RT objects.

These include:

  • RT Course
  • RT Treatment Phase
  • RT Prescription
  • Conceptual Volume including RT Dose Histogram, RT Dose Samples, RT Dose Image
  • RT Segment Annotation
  • RT Radiation Set including RT Radiation with records

Important aspects during the development of the new RT objects included:

  • Support for legacy and modern equipment
  • Use of new DICOM concepts: Enhanced objects, 3D segmentations, meshes, rigid and deformable registrations
  • Separate modelling for specific treatment modalities
  • Expandability

The final walk through, line by line reading, of the document was completed. Final discussions, especially around concept volume, are reflected in the document.

The supplement was voted Final Text and is becoming part of the standard.

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Sup 164 100% (Final Text)

This supplement introduces IODs that describe the administration of imaging agents. The supplement applies to all modalities in which imaging agents are introduced into a subject's circulatory system in a controlled fashion (e.g., CT, MR and XA) involving both automated and manual administration.

The new SOP Classes describe administration events, flows, pressure, timings, physio-chemical attributes and pharmacological attributes of the agent administration and consumables related to the administration.

  • The Planned Imaging Agent Administration SR Storage SOP Class represents patient specific plans to deliver the imaging agent. The plan is tuned to the characteristics of a patient and needs of that procedure.
  • The Performed Imaging Agent Administration SR Storage SOP Class is for reporting the actual administration delivered during a medical imaging study. The operator may program a delivery system with an intended delivery. This object captures the program. The delivery system or a user may deviate from the programmed plan based on a variety of factors. The actual delivery is captured in this object.

These SOP classes do not describe administration of radiopharmaceuticals, which is addressed by R-RDSR.

The comprehensive example was presented, discussed and improved. The example is expected to be a great help to implementors.

The supplement was voted Final Text and is becoming part of the standard.

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Multi Energy

Sup 188 100% (Final Text)

This Supplement extends the CT Image IOD and Enhanced CT Image IOD to support new types of images generated by Multi-energy (ME) CT scanners.

It describes various ME imaging techniques. While different vendors apply different techniques to achieve Multi-energy images, there is large commonality in the generated diagnostic images. It adapts existing attributes of the CT / Enhanced CT IOD to fit ME techniques.

Multi-energy CT acquires pixel information, which correlates to different X-Ray spectra to enable differentiation, quantification and classification of different types of tissues.

To detect the different X-Ray spectra, Multi-energy (ME) CT imaging uses combinations of different Source(s) and Detector(s) technologies such as current switching X-Ray tubes, spectral detectors, multi-layer detectors, multi-source and detector pairs.

Multi-energy CT data can be reconstructed and processed in different ways to serve a variety of purposes.

  • Differentiate materials that look similar on conventional CT images, e.g., to differentiate Iodine and Calcium in vascular structures or to differentiate vascular structures from adjacent bone.
  • Quantify base materials to accurately define tissues and organs. The intent is to quantify materials, and to extract regions and organs based on their composition.
  • Generate virtual non-contrast images from a contrast-enhanced image rather than having to scan the patient twice.
  • Reduce beam hardening artifacts.
  • Enhance the effect of contrast such as highlighting Iodine and soft tissue.

The presentation and discussion with the base standard group focused on codes and examples.

The supplement was voted Final Text and is becoming part of the standard.

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Security: EXTENDED
BCP195 TLS Profile

Sup 206 100% (Final Text)

This supplement adds a new Secure Connection profile to make DICOM consistent with the latest recommendations from the Japanese CRYPTREC committee by recommending support for all the ciphersuites included in the CRYPTREC recommendation.

The Extended BCP195 TLS Profile requires compliance with the IETF BCP195 Recommendations for Secure Use of Transport Layer Security (TLS) and Datagram Transport Layer Security (DTLS) plus support for the additional cypher suites specified by the CRYPTREC committee. This profile requires that TLS negotiation start with the strong security protection parameters, and allows progressive negotiation of weaker protection down to a specified minimum protection limit.

The CRYPTREC Committee validated the strength of cipher suites and identified 12 cipher suites that can be used with TLS 1.2, including some cipher suites not included in BCP195. In addition, a key length requirement that is stricter than BCP195 is specified.

The supplement was voted Final Text and is becoming part of the standard.

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Web Services

Sup 183 70% (Out for Letter Ballot)

This supplement Re-Documents (rewrites) PS3.18 Web Services.

The goals of this supplement are:

  • Factor out text that is common to multiple services and in doing so 1) ensure uniformity and 2) make that commonality more clear 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 no technical requirements of PS3.18 have been 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.

The supplement was voted ready to go out for Letter Ballot review and voting.

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Realtime Video

Sup 202 60% (Before Letter Ballot)

This Supplement describes 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 DICOM Real-Time Video (DICOM-RTV). The supplement defines an IP-based new 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.

Professional video (e.g., TV studios) equipment providers and users have defined in SMPTE (ST 2110 family of standards) a new standardized approach for conveying video and associated information.

SMPTE ST 2110 suite, elaborated on the basis of Technical Recommendation TR03 originated by the VSF (Video Services Forum) is used as a platform.

The supplement is will be presented in a upcoming base standard meeting before going out for letter ballot review and voting.

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Functional Acquisition
Paradigm Protocol

Sup 210 30% (Before Public Comment)

This supplement describes the storage of Paradigm Protocols, the Defined and Performed one. Also adding definition of a Stimuli object for Storage.

Paradigms are used to trigger stimuli used during functional scanning to capture the patient's brain activities.

The flow of events are:

  • A paradigm definition is created
  • A stimuli training run is performed with the patient and the responses are recorded.
  • An acquisition is executed with the paradigm stimuli.
  • Responses and acquired images are recorded and stored.
  • Suitable post processing is performed.

It is a working assumption that there is a paradigm creation app and specialized post processing involved.

Further progress will be presented in a later base standard meeting before going out for public comments.

Added Web support
retrieve ZIP containers

Sup 211 20% (Before Public Comment)

This supplement adds "application/zip" as an option in the DICOMweb WADO-RS specification, to retrieve an entire DICOM study or series as a single file.

One important use case to extend Part 18 is that researchers in analytics / machine learning users of DICOMweb want to retrieve studies / series / collections of images.

DICOMweb currently provides a mechanism "multipart/related". This requires special non-browser implementations to retrieve the content. There is no general web browser support for "multipart/related"

Additional considerations to consider, such as whether to include support for ZIP encryption, and whether to include flags to support DICOMDIR.

The first presentation was held. The document will be further discussed and presented to the base standard meeting before the public comment phase.

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CPack 98

WG-06 approved Final Text in November 2018.
Now part of the DICOM standard.
1700 Replace use of Derived Pixel Contrast Image/Frame Type Value 4 and Image Derivation with RWVM Quantity Definition Sequence 991 Clarify Handling of Private Data in the Retrieve Without Bulk Data Service 1663 Add Attribute to convey OPT Scan Patterns in OPT IOD 1746 Add a new code to CID 4270 OCT-A Algorithm Families for ratio analysis 1747 Update DICOM to reflect changes in IHTSDO SNOMED CT-DICOM Subset for JAN 2018 INT Release 1787 Consistency of Attributes added in Standard Extended SOP Classes 1788 Remove unnecessary use of no Baseline CID in templates and clarify conventions 1789 Allow categorical observations without measurements for ROIs in TID 1500 1790 Correct relationship of Reconstruction Algorithm in TID 10013 CT Irradiation Event Data 1791 Clarify Transfer Syntax for STOW-RS of PS3.10 files 1792 Clarify that elements defined in part 6 as GGxx,EEEE only apply where xx is even 1794 Correct some mistakes in PS3.4 annexes Y, Z, and AA 1795 Retire section I.4.1 of PS3.4 1796 DIMSE Service Element and DIMSE Service Group table caption 1798 Fix partly inconsistent list of VRs affected by certain types of Attribute Matching 1799 Fix list of VRs having a VM of 1 1801 Update to the Application Level Confidentiality Profile Attributes table 1802 Add refractive surgery type SMILE to CID 4234 Refractive Surgery Types 1803 Add Source of Data details for Corneal Size measurement values used in Intraocular Lens Calculations IOD (IOL 1804 Clarify handling of ICC profiles in WADO-RS for encapsulated images such as JPEG 1809 Add Coded form of Institutional Department

CPack 99

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

Current candidates for final text in March 2019

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