Setting value of "Contour Geometric Type". about rt-utils HOT 4 OPEN

A small update from my side:

I ended up converting all POINT and OPEN_PLANAR structures into CLOSED_PLANAR by expanding the number of triplets using the corresponding image serie dimensions to determine the new triplet positions, as this resultet in a better workflow for our physicians.
The reason for this, is that our delineation software has more tools available for CLOSED_PLANAR structures, whereas POINT structures had to be replaced by new delineations in order to adjust the size.

I'm not sure how common this is for other image software, but this approach will work when POINT and OPEN_PLANAR are not supported.

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Hi @mathiasgaede, thanks for the feedback.

I would love to help you guys expand your toolbox a little instead.

That would be awesome, we always are happy help new contributors.

Regarding what your are saying with the contours, what would be an ideal fix? We can change between OPEN_PLANAR / CLOSED_PLANAR based on the number of points. We can also provided an interface so that users can enable POINT's instead of
OPEN_PLANAR,

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A quick and dirty fix would just be to use the NumberOfContourPoints value to set the geometric type:

1 = POINT
2 = OPEN_PLANAR
3 <= CLOSED_PLANAR

For this part, i don't think you need any user input, as you just need the model output to be successfully transferred to the image software without information loss. The trouble here is with the OPEN_PLANAR part not always being supported, which i will test a few methods for this week. I'm working with Syngo.via from Siemens and Mirada XD from Mirada Medical, but i can also check stuff in Slicer3D, if that is the program you are using.

For OPEN_NONPLANAR and CLOSEDPLANAR_XOR i do think you need some kind of user decision to implement them properly, but I'm not familiar enough with your toolbox to suggest a way to implement it yet.

To handle empty spaces inside contours, such as dead areas inside a tumour, i currently just inverse the binary mask, discard the largest connected component and give the other components the CLOSEDPLANAR_XOR type. This function has to be manually activated, as it is not a situation that can happen for most image series i work with. I'm sure that there are smarter ways to implement this.

I have no personal experience with usage of OPEN_NONPLANAR and i have not yet had a use case for this.

Link to Dicom standard for geometric types:
http://dicom.nema.org/medical/dicom/current/output/chtml/part03/sect_C.8.8.6.html#sect_C.8.8.6.1

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@mathiasgaede thanks for the detailed response. We are hoping to publish the changes for this sometime over the next week.

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