Imaging Science in Dentistry

Korean Academy of Oral and Maxillofacial Radiology (대한영상치의학회)
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Effects of the cone-beam computed tomography protocol on the accuracy and image quality of root surface area measurements: An in vitro study

  • Received : 2023.04.24
  • Accepted : 2023.08.03
  • Published : 2023.12.31
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Abstract

Purpose: The objective of this study was to evaluate and compare the accuracy and image quality of root surface area (RSA) measurements obtained with various cone-beam computed tomography (CBCT) protocols, relative to the gold standard of micro-computed tomography (CT), in an in vitro setting. Materials and Methods: Four dry human skulls were scanned using 8 different protocols, with voxel sizes of 0.15 mm, 0.3 mm, and 0.4 mm. Three-dimensional models of the selected teeth were constructed using CBCT and microCT protocols, and the RSA was automatically measured by the image-processing software. The absolute difference in the percentage of the RSA(%ΔRSA) was calculated and compared across the 8 CBCT protocols using repeatedmeasures analysis of variance. Finally, image quality scores of the RSA measurements were computed and reported in terms of percent distribution. Results: No significant differences were observed in the %ΔRSA across the 8 protocols (P>0.05). The deviation in %ΔRSA ranged from 1.51% to 4.30%, with an increase corresponding to voxel size. As the voxel size increased, the image quality deteriorated. This decline in quality was particularly noticeable at the apical level of the root, where the distribution of poorer scores was most concentrated. Conclusion: Relative to CBCT protocols with voxel sizes of 0.15mm and 0.3mm, the protocols with a voxel size of 0.4 mm demonstrated inferior image quality at the apical levels. In spite of this, no significant discrepancies were observed in RSA measurements across the different CBCT protocols.

Keywords

Acknowledgement

The authors would like to thank the Department of Anatomy, Faculty of Medicine, Chiang Mai University for its support with the human dry skull samples; Ratikorn Kittada and the staff of the Division of Oral and Maxillofacial Radiology, Faculty of Dentistry, Chiang Mai University for their helpfulness and advice regarding the CBCT acquisition technique; and the Department of Radiology, Faculty of Medicine, Siriraj Hospital, Mahidol University for its support with the simulation software.

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