IJK to RAS direction Matrix

Support
1

Hello everyone,

Quick questions:
I have a CT scan. In its volume information is the IJK to RAS direction matrix.

ijktoras
ijktoras971×762 141 KB

Any measurements i do in the coronal, sagittal or axial views would now be in the RAS system correct?

And any models i make from segmentations in this volume would by default be in RAS since these arent voxel based?

And the RAS coordinates (or the position of the patient when compared to the world and IJK system) have been set when the initial scan was made, correct?

Thank you kindly in advance.

2

All assumptions are correct. By the way World and RAS are considered the same in Slicer.

1 Like
3

Thank you, I’m glad I’m starting to understand it.