Geometry direction

Hi

I am trying to understanding the geometric direction assumed in this toolbox. The python implementation is used.

Let's take Demo 03: Simple Image as an example.

This is the first slice of the projection.

Diagram shows the geometric definition in the Ander Biguri's Thesis (page 76)

Slice in the 1st, 2nd, and 3rd dimension of the reconstruction image volume, e.g. imgOSSART[25], imgOSSART[:, 25], and imgOSSART[..., 25] respectively.

My confusion comes from here: from the projection image and the diagram of the geometry, the x, y, z direction of the coordinate system seem are parallel with Medial/Lateral, Anterior/Posterior, and Superior/Inferior respectively. In combined with the observation of the slice of the reconstructed volume, the order of the dimension of the volume seems to be organized as [Z, Y, X]. It is a little bit odd for me to have a volume to be organized in this way. In addition, in the function of plotimg, it seems the order is assumed to be [X, Y, Z].

I am not sure if my understanding is correct, so I would like to have your clarification. Thank you!