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In the case of normal spines, the anatomy of all vertebrae cannot be simulta-
neously observed in any selected coronal orthogonal multi-planar cross-section, as
vertebrae come in and out of the sampling plane. On the other hand, in the case of
scoliotic spines, the anatomy of all vertebrae can be usually observed simulta-
neously in selected coronal orthogonal multi-planar cross-sections, as shown in
Fig.
15
.
Axial Orthogonal Multi-planar Cross-Sections
Axial orthogonal multi-planar cross-sections are obtained by sampling the 3D
image on selected axial planes that are orthogonal to axis z of the image-based
Fig. 16 An axial orthogonal multi-planar cross-section M
z
ΒΌ
z
c
of a 3D CT image of a scoliotic
spine, shown in a 3D view, b left sagittal view, c posterior coronal view and d superior axial view
of the image-based coordinate system (Note The image-based coordinate system and the spine
