Accuracy of three-dimensional measurements using cone-beam CT

Area of Science:

• Oral and Maxillofacial Radiology
• Dental Imaging Technology
• Biomedical Engineering

Background:

• Diagnosing intraosseous defects in the head and neck is challenging with 2D radiography.
• Three-dimensional (3D) CT data is valuable but often difficult to obtain.
• Cone-beam CT (CBCT) offers a potentially practical dental imaging solution.

Purpose of the Study:

• To validate the accuracy of linear and volumetric measurements of osseous defects using CBCT.
• To assess CBCT's reliability in determining the size and volume of bone lesions.
• To establish CBCT as a practical tool for oral and maxillofacial diagnosis.

Main Methods:

• Simulated bone defects were created in an acrylic block and a human mandible.
• Five examiners measured defect depth and diameter using CBCT.
• Volume extraction and comparison with known dimensions were performed using software.

Main Results:

• CBCT demonstrated high accuracy in linear measurements for both acrylic blocks and human mandibles.
• Volumetric measurements showed high accuracy, with manual measurements being more precise (-2.3 mm³).
• Paired t-tests indicated statistically significant accuracy for volumetric measurements (P < 0.001).

Conclusions:

• CBCT is a potentially accurate, non-invasive, and practical method for determining osseous lesion size and volume.
• The findings support CBCT's utility in oral and maxillofacial diagnosis.
• Further clinical validation is recommended to explore its wide-ranging applications.