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Segmentation Methods for Micro CT Images: A Comparative Study Using Human Bone Samples.

Karla Rovaris1, Polyane Mazucatto Queiroz1, Karla de Faria Vasconcelos1

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Summary

Objective segmentation in X-ray microtomography (microCT) analysis of human bone samples yielded results comparable to subjective methods. Objective segmentation is recommended for its lack of human input, ensuring accuracy in bone morphometry.

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Area of Science:

  • Biomedical Engineering
  • Orthopedics
  • Radiology

Background:

  • X-ray microtomography (microCT) is crucial for non-destructive bone morphometry analysis.
  • Accurate segmentation of bone from background is essential to prevent volume measurement errors.
  • Image segmentation methods significantly impact the reliability of microCT-based bone morphometry.

Purpose of the Study:

  • To compare subjective and objective image segmentation methods in microCT for human bone morphometric analysis.
  • To evaluate the influence of segmentation techniques on key bone parameters.

Main Methods:

  • Sixteen human bone samples with fixation screws were scanned using microCT.
  • Images were segmented using both subjective (manual thresholding) and objective (automated) methods.
  • Five bone morphometric parameters (BV/TV, Tb.Th, Tb.N, Tb.Sp, Conn.Den) were calculated and compared using ANOVA.

Main Results:

  • No significant differences were found between subjective and objective segmentation for any of the analyzed bone morphometric parameters (p > 0.18).
  • Intra- and interobserver agreement for subjective segmentation ranged from satisfactory to excellent.
  • Both methods produced comparable and reliable results for human bone morphometry.

Conclusions:

  • Subjective and objective segmentation methods provide similar outcomes for human bone morphometry using microCT.
  • Objective segmentation is recommended as the preferred method due to its inherent lack of human bias.
  • This finding supports the use of objective segmentation for homogeneous, high-resolution microCT studies of bone.