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Dentomaxillofacial Radiology (2003) 32, 50-59
© 2003 British Institute of Radiology
doi: 10.1259/dmfr/51868734

RESEARCH

A method for correction of radiographic errors in serial three-dimensional cephalometry

MM Rousset*,1, F Simonek2 and JP Dubus2

1 Laboratory for Cranial Development and Prevention, Faculty of Odontology, University of Lille, Lille, France; 2 Interaction, Image and Decision Engineering Laboratory, University of Science and Technology, Lille, France

*Correspondence to: Monique-Marie Rousset, Faculté d'Odontologie de Lille, Laboratoire de Morphogénèse Céphalique et Prévention, 1 Place de Verdun, 59000 Lille, France; E-mail: mrousset{at}univ-lille2.fr

Received 6 March 2001; revised 25 September 2001; accepted 9 September 2002

Objectives: To improve the accuracy of location of anatomical structures in serial three-dimensional (3D) cephalometric radiography.

Methods: A new method was developed to correct for geometrical errors in the calculation of the 3D coordinates of a point viewed on any two of three frontal, lateral and axial cephalometric radiographs. A computer-based method was used to reduce measurement errors. The methods were tested on a phantom containing metallic markers and on a dried skull.

Results: The mean corrected geometric error was 0.43 mm (SD 0.25 mm) compared with a maximum of 8 mm (SD 0.2 mm) when calculated directly from the radiographs. The mean computer-based measurement error was 0.46 mm (SD 0.34 mm) compared with 1.38 mm (SD 0.74 mm) when made directly from the radiographs.

Conclusions: The new method for the correction of radiographic errors in 3D serial cephalometric radiography appears to be sufficiently accurate to justify clinical evaluation.

Keywords: cephalometry; craniofacial abnormalities; maxillofacial development; radiography, dental






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