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Quantitative Assessment of 2-dimensional Parameters in Tomographic Images by Using Different Segmentation Methods.

Rafael V Camargo1, Jardel F Mazzi-Chaves2, Graziela B Leoni3

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|March 8, 2020
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Operator-dependent thresholding for cone-beam computed tomography (CBCT) measurements of root canal morphometry is more accurate than automatic methods. This finding impacts endodontic diagnosis and treatment planning.

Keywords:
Absolute errorOtsu’s thresholdingcone beam computed tomographymicrocomputed tomography

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Area of Science:

  • Endodontics
  • Dental Imaging
  • Morphometrics

Background:

  • Accurate assessment of root canal morphology is crucial for endodontic diagnosis and treatment.
  • Cone-beam computed tomography (CBCT) is a widely used imaging modality in dentistry.
  • Segmentation methods influence the accuracy of quantitative analysis from CBCT images.

Purpose of the Study:

  • To compare the accuracy of 2-dimensional root canal morphometric parameters derived from CBCT images using operator-dependent versus automatic (Otsu's) segmentation.
  • To evaluate the influence of different CBCT devices on morphometric accuracy.
  • To establish micro-computed tomography (micro-CT) as the reference standard for accuracy assessment.

Main Methods:

  • Ten mandibular molars were scanned using micro-CT and three CBCT devices.
  • Two segmentation methods (operator-dependent and Otsu's automatic) were applied to CBCT images.
  • 2D morphometric parameters (area, perimeter, roundness, diameters) were quantitatively assessed and compared against micro-CT reference values.

Main Results:

  • Operator-dependent thresholding yielded lower absolute errors for area, perimeter, and major/minor diameters compared to Otsu's method (P < .05).
  • No significant differences in accuracy were found between the evaluated CBCT devices.
  • CBCT imaging generally showed overestimation of area, roundness, and major/minor diameters, and underestimation of perimeter.

Conclusions:

  • Operator-determined segmentation provides superior accuracy for 2D root canal morphometry on CBCT compared to automatic Otsu's thresholding.
  • CBCT imaging parameters may require adjustments to mitigate over/underestimations in morphometric analysis.
  • Accurate morphometric data from CBCT is essential for informed endodontic diagnosis and treatment planning.