Figure 1.

Pairwise superimposed three-dimensional renderings of the blade by using the three consecutive rotational angles φ, θ and ψ. Drawing of the projection geometry of the points O, A and B during rotations in space. The y- and z-axis of the co-ordinate system represent the horizontal and vertical axis, respectively, of the flat image receptor in which each voxel of the whole-blade phantom will be projected to generate the ghost radiographic image. Project scheme of the blade with size in mm of the body and wings. Three directions: red ${\displaystyle (\overrightarrow{\mathrm{O}\mathrm{A}})}$, blue ${\displaystyle (\overrightarrow{\mathrm{O}\mathrm{B}})}$ and black ${\displaystyle (\overrightarrow{\mathrm{O}\mathrm{K}})}$ along the three major axes of the blade. Two components of the red vectors ${\displaystyle [{\overrightarrow{\mathrm{O}\mathrm{A}}}_{\mathrm{Y}},{\overrightarrow{\mathrm{O}\mathrm{A}}}_{\mathrm{Z}}]}$ and two components of the blue vectors ${\displaystyle [{\overrightarrow{\mathrm{O}\mathrm{B}}}_Y,{\overrightarrow{\mathrm{O}\mathrm{B}}}_{\mathrm{Z}}]}$, respectively, along ${\displaystyle \overrightarrow{\mathrm{O}\mathrm{A}}}$- and ${\displaystyle \overrightarrow{\mathrm{O}\mathrm{B}}}$-direction (respectively the red and blue arrows in the radiograph) as appearing in a two-dimensional image.