Once you’ve determined the coordinates of a point in IJK coordinates, how do you visualize it in RAS coordinates? Do we have to do a coordinate transformation first?
RAS are not coordinates but rather orientation.
They can be thought of as a coordinate system in Slicer.
e.g. volume nodes have an IJK-RAS coordinate transformation
and perhaps other things
I’m not sure what “visualize” means here, but if it’s a volume node you can use GetIJKToRASMatrix
to go between the two coordinate systems.
Maybe this can help: Script repository — 3D Slicer documentation