CephalometricsCephalometrics is the interpretation of lateral skull radiographs taken under standardized conditions.
Typically, the patient is placed in a cephalostat. This positions the patient with their head oriented at 90o
to the X-Ray beam at a distance of 5ft from the tube. The film is
placed 15 inches from the head. This is a standard under which all
cephalometric radiographs are taken worldwide. It ensures that
radiographs taken at different centers are directly comparable.
The film is then traced and various standard landmarks, lines and
angles are measured and recorded. This allows comparison with normal
values for a population and assessment of growth and/or effects of
treatment.
From : http://www.ncl.ac.uk/dental/ortho/ass-ceph.htm
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