Tutorial: conformance

conformance

This page details which parts of DICOM the DWV supports and also plans to support... This is mainly guided by the demo data that I have, so if you have data that is not supported, please provide me some and I'll try to integrate it.

Main reference: DICOM/2013. The dictionary was generated using part06/chapter_6.

Validity

All DICOM files should start with the DICOM prefix DICM (see DICOM File Meta Information). If not, it is not a valid DICOM. Since v0.26 (#188), the parser will attempt to parse data without the prefix but there are no guaranty of results!

Transfer syntax

See the definition and the UID list.

  • 1.2.840.10008.1.2: Implicit VR - Little Endian -> ✅ (since v0.2)
  • 1.2.840.10008.1.2.1: Explicit VR - Little Endian -> ✅ (since v0.2)
  • 1.2.840.10008.1.2.1.99: Deflated Explicit VR - Little Endian -> ❌
  • 1.2.840.10008.1.2.2: Explicit VR - Big Endian -> ✅ (since v0.2)
  • 1.2.840.10008.1.2.4.100: MPEG2 Image Compression -> ❌
  • 1.2.840.10008.1.2.4.5[0,1]: JPEG -> ✅ (since v0.11, see #61)
  • 1.2.840.10008.1.2.4.[57,70]: JPEG Lossless -> ✅ (since v0.11, see #165)
  • 1.2.840.10008.1.2.4.5[others]: retired JPEG -> ❌
  • 1.2.840.10008.1.2.4.6*: retired JPEG -> ❌
  • 1.2.840.10008.1.2.4.8*: JPEG-LS -> ❌
  • 1.2.840.10008.1.2.4.9*: JPEG 2000 -> ✅ (since v0.5, see #131)
  • 1.2.840.10008.1.2.5: RLE -> ✅ (since v0.26, see #636)

Photometric Interpretation

See the definition. The planar configuration (definition) is used to define the memory layout of colour images.

  • MONOCHROME1 -> ✅ (since v0.2)
  • MONOCHROME2 -> ✅ (since v0.3)
  • PALETTE COLOUR -> ✅ (since v0.27, see #664)
  • RGB -> ✅ (since v0.3, both planar configuration)
  • YBR_FULL -> ❌
  • YBR_FULL_422 -> ✅ (since v0.15)
  • YBR_PARTIAL_422 -> ❌
  • YBR_PARTIAL_420 -> ❌
  • YBR_ICT -> ❌
  • YBR_RCT -> ❌

Data elements

All Value Representations (VR) should be supported. See the official list.

WADO

Web Access to Dicom persistent Objects (WADO) is part of the DICOMWeb services defined in Part 3.18. WADO-URI can be provided in the DWV URL using ?input= since v0.3.

Arguments follow regular URI standard.

  • requestType: WADO. Required
  • contentType: Required
    • application/dicom (see transfer syntax above for support)
    • image/jpeg ✅ (since v0.3)
    • image/gif ✅ (since v0.3)
    • image/png ✅ (since v0.3)
    • image/jp2 ❌
  • studyUID, seriesUID, objectUID. Required
  • anonymise: true or false.
  • If the type is image, then rows, columns, windowWidth, windowCenter and more can be specified.

Example:

http://dicom.vital-it.ch:8089/wado?
   requestType=WADO&
   contentType=application/dicom&
   studyUID=2.16.840.1.113669.632.20.1211.10000744858&
   seriesUID=1.3.6.1.4.1.19291.2.1.2.2413568109772100001&
   objectUID=1.3.6.1.4.1.19291.2.1.3.2413568110716100007

Pixel data

File data storage, either one frame per file or multiple:

  • Single-frame data: ✅ (from start!)
  • Multi-frame data: ✅ (since v0.15.0, see #132)

Character sets

  • without code extensions: ✅ (since v0.15.0, see #248)
  • with code extensions: ❌

Radiotherapy

The Part PS 3.3 of the DICOM Standard specifies the set of Information Object Definitions (IODs) which provide an abstract definition of real-world objects applicable to communication of digital medical information. The Attributes of an IOD describe the properties of a Real-World Object Instance. Related Attributes are grouped into Modules which represent a higher level of semantics documented in the Module Specifications found in Annex C of the DICOM Standard. Source: leadtools.

This list are the modules of interest: