A comparison between 2D and 3D methods of quantifying facial morphology.

Area of Science:

• Medical Imaging
• Anthropometry
• Forensic Science

Background:

• Two-dimensional (2D) and three-dimensional (3D) imaging techniques are widely used for facial morphology assessment.
• Direct anthropometric methods have been largely replaced by these imaging techniques.
• Quantification of the differences between 2D and 3D methods is lacking.

Purpose of the Study:

• To compare and quantify the differences between 2D and 3D imaging techniques in facial morphology assessment.
• To determine if 2D and 3D anthropometry can be used interchangeably.

Main Methods:

• 150 subjects (75 males, 75 females) from northern Nigeria (Hausa ethnic group) were included.
• Facial dimensions were generated from digital camera (2D) photographs and 3D surface laser scans.
• Data were analyzed using R-statistic software with paired sample t-tests and Pearson correlation.

Main Results:

• A very low intraclass correlation coefficient (ICC) of 0.26 indicated significant differences between 2D and 3D measurements.
• Measurements from the 3D laser scanner were consistently higher than those from the 2D camera.
• A statistically significant positive difference was observed between the 3D and 2D methods.

Conclusions:

• There are statistically significant variations between 2D and 3D anthropometric methods for facial morphology assessment.
• 2D and 3D anthropometry cannot be used interchangeably in clinical or forensic applications.
• Further research may be needed to establish specific applications for each technique.