SecretariatMedical Imaging & Technology Alliance (MITA)
Lisa Spellman, dicom@dicomstandard.org
ChairsAllan Noordvyk, Change Healthcare
Justin Ryan, Rady Children’s Hospital-SD
wg17chairs@dicomstandard.org
Last strategy update2019-04-05
MinutesWG-17 minutes

 

Scope

  • To facilitate a way to store/query/retrieve 3D models, intended for 3D, as DICOM objects (Work Item 1). The approved Work Item is focused on (a) leveraging the existing and growing ecosystem of DICOM-capable systems in use in healthcare institutions and (b) leveraging standards already in use in the 3D printing industry
  • As noted above, a new scope has been proposed:
    • New Proposed Scope: The WG would operate on the following general mandate:
  • Extend and promote the use of DICOM for the creation, storage and management of 3D printing models in a healthcare setting, where the model is either (a) derived from medical images, or (b) expected to be compared / composited with medical images.
  • [New] Extend and promote the use of DICOM for the creation, storage and management of virtual reality, augmented reality, and mixed reality models in a healthcare setting, where the model is either (a) derived from medical images, or (b) expected to be compared / composited with medical images.

Current Supplements, Work and Objectives:

  • WG17 completed Supplement 205, DICOM Encapsulation of STL Models for 3D for the encapsulation of the STL 3D file format. This supplement became part of the 2018b DICOM specification.
  • WG17 has an internal draft for Sup/208 for the encapsulation of advanced 3D file formats which will be presented to WG-06 at the June 2019 meeting for a line-by-line review.
    • WG17 conducted broad-based survey in April 2017 to understand which of the following 3D model file formats should be encapsulated: GCODE, STL, X3D, AMF, 3MF, OBJ, PLY, VRML
    • STL was file format most frequently used
    • Followed by X3D/VRML, OBJ, and 3MF
    • Other formats were rejected
    • WG17 has decided to delay review of Sup/208 by WG06 until it has more information regarding the encapsulated file formats.
  • WG17 is currently developing a ‘marketing’ video to support adoption of DICOM 2018b’s adoption of Supplement 205.
  • WG17 is working on an educational exhibit on 3D printing and DICOM for the Society of Imaging Informatics in Medicine (SIIM) meeting in June. This effort is being taken in coordination with both the SIIM and the MITA outreach teams. This exhibit will feature the video from (3) above.
  • WG17 is also working on a series of short videos (“Library Videos”) to illustrate utility from WG17s work product. The video will primarily be used to support awareness efforts of 3D in medicine.
  • The Co-Chairs of WG17 attended an inaugural meeting of the ASME Medical AM/3DP Advisory Group on March 22, 2019.       On-going engagement with ASME is anticipated with the intent that opportunities to align ASME and MITA direction will be identified and reported back to appropriate MITA committees.

Challenges and Opportunities (Environment):

  • The current level of enthusiasm for a standards-based approach in both end-user and vendor community appears high. Moving quickly to put the WG in motion can leverage this to address both risks above
  • There are a number of competing native data format standards for high fidelity 3D models outside of medicine, and no “lingua franca” appears to be developing in the near term
    • Different vendors and end-user communities favor different data formats as their primary working one
    • DICOM would need to take fairly neutral approach with respect to working with these data formats (suggesting an encapsulation approach, similar to what was done with PDF)
    • The STL data format, although older and limited, is near universally supported and thus may be leveraged as a baseline, to maximize interoperability
  • A 3D shape visualization capability of PDF is used at many institutions as part of the preview workflow
    • This appears to be compatible with DICOM PDF encapsulation IOD as it exists today
  • Unlike the case with medical printers, there appears to be no good case for DICOM directly support communicating with 3D printers themselves
    • There exists a final stage of preparing a 3D model for a specific printer’s capabilities and build material options before initiating printing
    • This final stage is already well addressed by vendors in this space and has no dependency on whether the object to be printed is related to a patient or is for some other purpose
    • DICOM’s scope can thus stop after delivering a 3D model to this final prep software
  • Many institutions have extended their 3D visualization labs to encompass 3D printing requests from clinical staff
    • This presents a community with knowledge of other DICOM-enabled workflow that could be leveraged for WG activities.

Future Roadmap and Objectives (Committee Direction):

  • The WG-17 roadmap is based upon the analysis of the 3D+ data and workflow needs through a standard framework. The results of this analysis would then be used to specify information objects and services needed to best serve patients and the imaging-based 3D printing medical community.
  • As much as possible and compatible with DICOM guiding principles, the new specifications this would be proposed in a manner to (a) leverage the existing and growing ecosystem of DICOM-capable systems in use in healthcare institutions and (b) leverage standards already in use in the 3D+ industry.
  • The ultimate goal is a comprehensive, standards-based digital platform for 3D+ in the patient care setting, of which DICOM-based imaging would be a significant part.

Past Work:

  • Completion of Sup/205 and adoption into the 2018b specification of DICOM.
  • STL was IANA registered.
  • WG17 completed Supplement 205, DICOM Encapsulation of STL Models for 3D for the encapsulation of the STL 3D file format. This supplement became part of the 2018b DICOM specification.