چکیده
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Incorrect patient positioning and the resultant image distortion occur in many radiographic
examinations. This study aimed to assess the effect of tilting, rotation and tipping of
the head on the accuracy of maxillofacial transverse measurements made on cone beam
computed tomography (CBCT) scans. The CBCT scans were obtained in central position of
10 dry human skulls. Using three-dimensional (3D) Dolphin software, six positions namely
10° and 20° tilts, rotations and tips were reconstructed of central position. Transverse
distances between landmarks were measured on 3D scans and the skulls. The intraclass
correlation coefficient (ICC) and the Bland-Altman plot were used to compare the mean
values measured by the two observers. For most landmarks, no significant differences
were noted between the mean transverse distances measured in the six positions and
those measured in central position on 3D scans (p>0.005). In conclusion, all measurements
of transverse distances made on 3D scans in different positions were underestimated
compared to the actual values measured on the skull.
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