Influence of mandibular positioning on the accuracy and reliability of linear measurements on cone beam CT using different voxels and two software programs
DOI:
https://doi.org/10.5335/rfo.v25i3.13336Keywords:
dimensional measurement accuracy; cone beam computed tomography; diagnostic imaging; mandible; software.Abstract
Objective: this study evaluated the accuracy and reliability of linear measurements on cone beam CT (CBCT)
scans in two software programs, using different voxels and varying mandible positioning. Material and methods:
CBCT images of 10 human mandibles with 25 markers were obtained using different acquisition protocols
(0.250, 0.300, 0.400-mm voxels) and mandible orientations (centered, rotated 10° laterally to right and
left, tilted 10 up and down); fourteen measurements were carried out on the multiplanar reconstructions in
XoranCat and OsiriX Lite software programs. The findings were compared to physical measurements using a
digital caliper. ANOVA and correlation coefficient tests were used, at α = 0.05. Results: there was no statistically
significant difference when the measurements were compared in acquisitions with different voxel sizes
analysed in both software programs. Mandibular positioning changes did not influence the measurements.
No differences were found when the values were compared between the software programs and the digital
caliper. Conclusion: linear measurements in both programs were reliable and accurate compared with physical
measurements when using all acquisition protocols. The accuracy and reliability of the measurements
were not influenced by variations in the mandible positioning.
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