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Fig. 18 A coronal oblique multi-planar cross-section M
y
¼
y
c
;c
¼
c
p
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
z¼z
c
;a
¼
a
p
ð
x
;
y
Þ
¼
I
ð
R
ða
p
;
0
;
0
Þ
½
x
;
y
;
z
c
Þ
¼
I
ð
R
x
ða
p
Þ
½
x
;
y
;
z
c
Þ;
ð
65
Þ
M
z¼z
c
;b
¼
b
p
ð
x
;
y
Þ
¼
I
ð
R
ð
0
; b
p
;
0
Þ
½
x
;
y
;
z
c
Þ
¼
I
ð
R
y
ðb
p
Þ
½
x
;
y
;
z
c
Þ:
ð
66
Þ
Figure
19
displays the axial oblique multi-planar cross-section M
z¼z
c
;a
¼
a
p
(Eq.
65
)atz
25
.
¼
z
c
and
a
¼
a
p
¼
