Comparison of the accuracy of linear measurements in CBCT images with different field of views

Authors

  • Mojdeh Mehdizadeh Isfahan University of Medical Sciences
  • Ali Erfani Isfahan University of Medical Sciences
  • Parisa Soltani Isfahan University of Medical Sciences

DOI:

https://doi.org/10.11606/issn.2357-8041.clrd.2022.194059

Keywords:

Cone beam computed tomography, Linear measurement, Mandible

Abstract

This study sought to investigate the effect of the field of view (FOV) on linear measurements of cone beam computed tomography (CBCT) images. Methods: In this in vitro study, five dry human skulls were used. After using red wax to simulate soft tissue, the skulls were scanned using Galileos CBCT scanner (Sirona, Bensheim, Germany) with exposure parameters of 85 kVp and 21 mAs and voxel size of 0.280 mm; once with FOV of 15 cm × 8 cm and once again with 15 cm × 15 cm. The measured distances were the distance between the center of the bilateral mental foramen in the axial view (MM), the distance between the alveolar crest and the mandibular inferior border in the sagittal view on the midline (CB), and the depth of the socket of the left mandibular central incisor (L1). Descriptive statistics as well as Pearson’s correlation coefficient were used for statistical analysis (α = 0.05) using SPSS software (v. 25, IBM, NY, USA). Results: The measurements obtained with small and large FOV and with the dry skull were not significantly different (p > 0.05). The measurements obtained in small FOV had excellent correlation coefficient when compared with those obtained with the dry skull, with values of 0.890 for MM, 0.954 for CB, and 0.921 for L1 (p < 0.001). The measurements in large FOV also had excellent correlation coefficient when compared with those on the dry skull, with values of 0.894 for MM, 0.949 for CB, and 0.902 for L1 (p < 0.001). Conclusion: According to our findings, linear measurements obtained by CBCT scans in small and large FOVs were not significantly different than those on dry skulls. Since the linear measurements are accurate regardless of FOV size, selection of FOV must be based on patient factors, such as area of interest and radiation dose.

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Author Biographies

  • Mojdeh Mehdizadeh, Isfahan University of Medical Sciences

    Department of Oral and Maxillofacial Radiology, Dental Implants Research Center, Dental Research Institute School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran

  • Ali Erfani, Isfahan University of Medical Sciences

    Students Research Committee, School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran

  • Parisa Soltani, Isfahan University of Medical Sciences

    Department of Oral and Maxillofacial Radiology, Dental Implants Research Center, Dental Research Institute, School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran

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Published

2022-04-06

Issue

2022

Section

Original Research

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Copyright (c) 2022 Mojdeh Mehdizadeh, Ali Erfani, Parisa Soltani

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