Operating system: window 11
Slicer version: 4.13.0
Hi, everyone
I tried to mark a point on the 3d slicer through the markups tool and load the position data.
Here is the code I used.
node_mark = slicer.util.getNode(‘F’)
wcs_data = arrayFromMarkupsControlPoints(node_mark, True)
Comparing wcs_data and node_mark shows the same coordinates.
I thought node_mark would belong to the RAS coordinate system and
wcs_data to belong to the world coordinate system, but isn’t it like this?
3D Slicer’s world coordinate system is the RAS coordinate system.
Hi Lassoan,
Thx for answering !
But I’m still confused
Since the python module I made that I want to extend with 3D slicer follows w.c.s (general world coordinate system), do RAS coordinates of 3D slicer refer to normal w.c.s?
To display any node in a custom coordinate system, add a transform node, set its transform to parent matrix, and set this transform in the transformable node.
hum…
Actually, the question was whether the 3D slicer’s RAS coordinate system is the (general - people think) world coordinate system. However, if you refer to the reference of lassoan, it seems to be roughly understood. I will try and come back if successful.
the question was whether the 3D slicer’s RAS coordinate system is the (general - people think) world coordinate system
Yes, the world coordinate system of the application is the RAS coordinate system. For example, when you load a medical image then the image is displayed so that the image origin is aligned with the world coordinate system origin; R, A, S axes of the image are the first, second, and third axis of the world coordinate system; and world coordinate system unit is millimeters.