Relationship between DICOM coordinate system and IEC 61217 coordinate system

zhuangming.shen · October 3, 2020, 1:52am

Do anyone know what’s the relationship between the DICOM coordinate system used by ITK and IEC 61217 coordinate system such as gantry coordinate system, beam limiting device coordinate system, etc? How can I transform between them using ITK? I’m confused about them for a long time. Any comments are welcomed.

lassoan · October 3, 2020, 3:56pm

3D Slicer’s SlicerRT extension contains full IEC 61217 / DICOM mapping. The most relevant file for you is probably this one:

github.com

SlicerRt/SlicerRT/blob/master/Beams/Logic/vtkSlicerIECTransformLogic.h#L39-L92


      
          

          /// \ingroup SlicerRt_QtModules_Beams

          /// \brief Logic representing the IEC standard coordinate systems and transforms.

          ///

          /// The IEC standard describes coordinate systems and a transform hierarchy to

          /// represent objects taking part in an external beam radiation therapy delivery in 3D space.

          /// With this logic class it is possible to get a transform from any defined coordinate

          /// system to another by simply inputting the coordinate systems. The logic can observe an

          /// RT beam node to get the geometrical parameters defining the state of the objects involved.

          /// Image describing these coordinate frames:

          /// https://github.com/SlicerRt/SlicerRtDoc/blob/master/technical/IEC%2061217-2002_CoordinateSystemsDiagram_HiRes.png

          ///

          

          /*

                                    "IEC 61217:2011 Hierarchy"

          

                             -------------------("f")---------------------

                             |                    |                      |

                  ---------("g")                ("i")                  ("s")

                  |          |                    |                      |

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If you work with ITK and radiation therapy then you may SlicerRT useful, as it contains infrastructure for import/export/visualize/edit all RT data (structure sets, plans, images, beams, dose maps, dose volume histograms, transformations), evaluate/compare/create plans, apply transforms, accumulate dose, etc. All free, restriction-free, open-source, fully usable from Python or C++. See more information at www.slicerrt.org.

zhuangming.shen · October 4, 2020, 8:22am

@lassoan Thanks for your useful information.

ma1282029525 · May 19, 2023, 2:59am

How to port slicerRT to programs outside of slicer

lassoan · May 20, 2023, 4:42am

You can run Slicer from any other program. For example,you can simply pass a Python script that Slicer executes, or you can use Slicer as a web service via its REST API.