Comparison of mandibular bone microarchitecture between micro-CT and CBCT images

Area of Science:

• Biomedical Imaging
• Dental and Maxillofacial Radiology
• Bone Histomorphometry

Background:

• Micro-computed tomography (µCT) provides high-resolution imaging for bone microarchitecture analysis.
• Cone-beam computed tomography (CBCT) is increasingly used in dentistry and maxillofacial applications.
• Direct comparison of bone microarchitecture parameters between µCT and CBCT is crucial for clinical translation.

Purpose of the Study:

• To compare bone microarchitecture parameters derived from µCT scans with those obtained from CBCT scans.
• To evaluate the accuracy and reliability of CBCT for assessing bone structure.

Main Methods:

• Bone samples were scanned using both µCT (20 µm voxel size) and CBCT (80 µm voxel size).
• Key microarchitecture parameters were analyzed, including bone volume per total volume (BV/TV) and bone surface per total volume (BS/TV).
• Correlation coefficients were calculated, and CBCT data was calibrated to µCT values to assess error.

Main Results:

• Correlation varied significantly across parameters, with R-values ranging from 0.05 to 0.83.
• Significant correlations were found for 8 out of 16 analyzed parameters.
• After calibration, the normalized error for BV/TV was 0.48, while other parameters showed errors between 0.58 and 2.10.

Conclusions:

• CBCT demonstrates some correlation with µCT for bone microarchitecture, but with considerable uncertainty.
• The observed errors, particularly for certain parameters, may exceed acceptable limits for direct clinical application.
• Further validation is needed before widespread clinical adoption of CBCT for quantitative bone microarchitecture analysis.