Effect of Head Position on Maxillofacial Transverse Measurements Made on the Skull and Cone Beam Computed Tomography Scans

Abstract

Article 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.

Evaluation of the linear and volumetric measuring changes in different positions in CBCT

“…The results of studies carried out by (Adibi et al, 2017;Almeida et al, 2021;Kakumoto et al, 2021;Shokri et al, 2016) regarding the accuracy of linear measurements confirmed the present findings. In line with the present results, Tolentino et al (Tolentino et al, 2018) performed linear measurements on CBCT scans with three different voxel sizes using three different software programs.…”