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through the midline of the body and, assuming bilateral symmetry, divides the
body into left and right halves is the mid-sagittal plane),
a coronal or frontal plane
is any plane that passes from the left to the right,
and from the superior to the inferior part of the body, therefore dividing the
body into anterior and posterior sections (the coronal plane that passes through
the midline of the body and, assuming bilateral symmetry, divides the body into
anterior and posterior halves is the mid-coronal plane),
ð
x
;
z
Þ
an axial or transverse plane
is any plane that passes from the left to the
right, and from the anterior to the posterior part of the body, therefore dividing
the body into superior and inferior sections.
ð
x
;
y
Þ
The image-based coordinate system is therefore a right-handed Cartesian coor-
dinate system with a standard orthonormal basis (Fig.
1
).
3
I
Fig. 1 The image-based coordinate system
!ð
x
;
y
;
z
Þ
of a 3D image of a scoliotic spine,
shown in a 3D view, b left sagittal view, c posterior coronal view and d superior axial view
R
