A method for three-dimensional measurement by cineradiography
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The purpose of this study was to devise a method for three-dimensional (3-D) measurement of the craniofacial complex by means of cineradiography, and to assess the errors of this method.
A perspective transformation method was applied to biplane cineradiography in combination with the correction of geometric distortion of cineradiographic images by the quadratic transformation. As an aid in determining the errors, landmarks on a dry skull surrounded by geometric reference points were imaged by both conventional and cineradiography in the two planes. Distance error dD (differences between calculated distances from reconstructed 3-D coordinates and measured distances by slide caliper) and displacement error dP (differences between reconstructed 3-D coordinates and those calculated from distances measured by slide caliper) by conventional, cineradiographic, and a combined method of the two were compared. These results indicate that the accuracy of the perspective transformation method by conventional, cineradiographic and the combined method would result in 0.3 mm, 0.4 mm, 0.7 mm respectively in space.
Key WordsBiplane cineradiography TMJ accuracy of three-dimensional measurement
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