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Cranial base foramen location accuracy and reliability in cone-beam computerized tomography.

Manuel O Lagravère¹, Jillian M Gordon, Carlos Flores-Mir

¹Orthodontic Graduate Program, Department of Dentistry, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, Alberta, Canada. mlagravere@ualberta.ca

American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics

|March 12, 2011

Summary

Cone-beam computed tomography (CBCT) reliably and accurately locates cranial base foramina, including spinosum, ovale, rotundum, and hypoglossal canals. These findings support their use in establishing 3D reference coordinate systems for future analyses.

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Area of Science:

Anatomy
Radiology
3D Imaging

Background:

Accurate anatomical landmark identification is crucial for 3D analysis.
Cone-beam computed tomography (CBCT) offers advanced imaging capabilities for cranial base structures.

Purpose of the Study:

To assess the reliability and accuracy of CBCT in locating specific cranial base foramina.
To evaluate the suitability of these foramina as landmarks for future 3D reference coordinate systems.

Main Methods:

CBCT scans of 10 dry skulls were analyzed.
Foramina ovale, spinosum, rotundum, and hypoglossal canals were identified by three evaluators.
Intraclass correlation coefficients and descriptive statistics were used to measure reliability and accuracy.

Main Results:

High intra-examiner and inter-examiner reliability (ICC > 0.9) were observed for most landmark coordinates.
Mean measurement error was generally below 0.5 mm.
Mean distance differences compared to the gold standard were below 1.3 mm.

Conclusions:

Foramina spinosum, ovale, rotundum, and the hypoglossal canal are reliable and accurate landmarks.
These foramina are suitable for establishing reference coordinate systems.
CBCT is a valuable tool for precise anatomical landmark identification in 3D analysis.