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Fig. 14 A sagittal orthogonal multi-planar cross-section M
x¼x
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
curve correspond to Figs.
1
and
7
)
M
x¼x
c
ð
y
;
z
Þ
¼
I
ð
x
c
;
y
;
z
Þ:
ð
49
Þ
In the case of normal spines, the anatomy of all vertebrae can be usually
observed simultaneously in selected sagittal orthogonal multi-planar cross-sections.
However, in the case scoliotic spines, vertebrae come in and out of the sampling
plane, and therefore the anatomy of all vertebrae cannot be simultaneously observed
in any selected sagittal orthogonal multi-planar cross-section, as shown in Fig.
14
.
