Three-Dimensional Cephalometric Landmark Annotation Demonstration on Human Cone Beam Computed Tomography Scans

Area of Science:

• Dentistry
• Orthodontics
• Medical Imaging

Background:

• Craniofacial cephalometric analysis traditionally uses 2D radiographs, limiting assessments to size, linear/angular measurements, and 2D relationships.
• The widespread adoption of 3D cone beam computed tomography (CBCT) in dentistry necessitates an evolution to 3D cephalometric analysis.

Purpose of the Study:

• To demonstrate a validated protocol for 3D cephalometric analysis using skeletal landmarks on human CBCT scans.
• To provide detailed instructions for landmark annotation on 3D volumes for clinical and research applications.

Main Methods:

• Utilized a validated set of skeletal tissue landmarks on human CBCT scans.
• Developed a step-by-step protocol for annotating each landmark on a 3D volume.
• Generated 3D coordinates and measurements of landmarks for export.

Main Results:

• Successfully demonstrated the feasibility of 3D cephalometric analysis on CBCT data.
• Provided a reproducible protocol for 3D landmark annotation and measurement.
• Enabled export of 3D landmark data for clinical and research use.

Conclusions:

• 3D cephalometric analysis offers a more comprehensive assessment of craniofacial structures, incorporating shape and 3D relationships.
• This methodology advances the analysis of craniofacial growth and development.
• The protocol facilitates future advancements in basic and clinical craniofacial research.