Abstract

BAENA, Gloria; ZUNIGA, Janneth  and  PENA, Elizabeth. Distortion in cone-beam computed tomography images. Rev Esp Cirug Oral y Maxilofac [online]. 2013, vol.35, n.2, pp.51-58. ISSN 2173-9161.  https://dx.doi.org/10.1016/j.maxilo.2012.03.002.

Objective: To quantify the distortion in Cone-Beam Computed Tomography images of different regions of the human skull and mandible. Methods: With the tracing of three horizontal and four vertical planes, fifteen quadrants were delimited in thirty dry human skulls with their articulated jaws. Stainless steel wires were placed in the sagittal, coronal and transverse (axial) planes in each of the quadrants. A cone-beam computerized tomography (CBCT) was taken of each correctly positioned specimen and the wire lengths were measured in the bone specimens (real measure) and in the images (tomographic measure), for comparison. The Concordance Correlation Coefficient (CCC) and the Mean Differences statistical tests were applied to the data. Results: Since the CCC found for all the quadrants was always above 0.80, the tomographic measurements can be considered statistically reliable. However, the values obtained in all the spatial measurements revealed that in all the quadrants some percentage of distortion was present, being magnification for some and minification for others. The maximum distortion was present in the vertical measurements of the quadrants located in the middle line or close to it, and the minimum percentage in the horizontal measurements. Conclusion: The distortion present in the different regions of the skull and mandible is not statistically significant, but it is advisable to take it into consideration to avoid errors that can occur in the clinical practice.

Keywords : Cone-Beam Computed Tomography; Distortion; Magnification; Minification.

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