How to use linear transform to convert X,Y Coordinate to RAS coordinates

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Hi everyone,

I have multiples 2D coordinates (X,Y). These coordinates are all mapped by a linear transform in which I have access. I’m wondering if there’s a way to convert a 2D coordinates using the linear transform matrix to RAS programatically using python.

For exemple, my 2D coordinate would look like this [220, 100] and my linear transform matrix :
[-0.28146, 0.958297, 0.0494615, 142.429, 0.955756, 0.275374, 0.103442, 134.392, 0.0855075, 0.0763878, -0.993405, -37.0582, 0, 0, 0, 1]

I want to convert my coordinate to RAS so I can then programatically display segmentations in 3D.
I’m new to slicer and is wondering if this is possible to do?

Thank you in advance!

2

You can get the xy to RAS transform for a given slice view from the slice node, using this function: Slicer/vtkMRMLSliceNode.h at 177f3b324247de4e77d4497cc9121fe37dd5b3f3 · Slicer/Slicer · GitHub

You can get the slice node like this:
https://slicer.readthedocs.io/en/latest/developer_guide/script_repository.html#change-slice-orientation

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