J Korean Assoc Oral Maxillofac Surg.  2001 Jun;27(3):214-220.

Development of three dimensional measuring program with frontal and lateral cephalometric radiographs: PART 1. Computation of the three-dimensional coordinates by compensation of the error of the head position in ordinary non-biplanar cephalostat

• Lee GH
• Lee SH
• Jang HJ
• Kwon TG

Abstract

The clinical application of the three-dimensional radiographic technique had been limited to standard Broadbent-Bolton cephalometer with biplanar stereoradiography. We developed a new method for compensating the error of head position in ordinary non-biplanar cephalostat. It became to possible to use the three dimensional cephalogram commonly in clinical bases. 1. The method of methemetical compensation of head positioning error in non-biplanar condition was evaluated with dry skull. The error of the method of first and the second trial was 0.46+/-1.21, 0.33+/-0.90mm, which means the error of the head positioning correction in conventional cephalogram was within clinical acceptance. 2. The reproducibility of this system for clinical application was 0.54 mm (-2.99~2.26mm) which defines the absolute mean difference of the first and second trial. Compare to the The landmark identification error 1.2+/-1.6mm, the error of the measurement was within the range of landmark identification error. The result indicates the adequate clinical accuracy of the computation of three-dimensional coordinates by compensation of the error of the head position in ordinary non-biplanar cephalostat.

Keyword

Three dimensional coordinates; Non-biplanar cephalostat

MeSH Terms

Compensation and Redress*
Head*
Skull