Measurement of Scars Using Structured-Light 3D Scanning in Forensic Practice

Area of Science:

• Biomedical Engineering
• Forensic Science
• Medical Imaging

Background:

• Accurate scar measurement is crucial for medical and legal assessments.
• Traditional methods for scar measurement can be time-consuming and prone to error.
• The application of advanced 3D scanning technology in scar analysis requires validation.

Purpose of the Study:

• To validate the accuracy and reliability of structured-light three-dimensional (SL-3D) scanning for measuring scar dimensions.
• To assess the utility of SL-3D scanning in forensic practice for scar analysis.
• To compare SL-3D scanning measurements with conventional methods.

Main Methods:

• SL-3D scanning was employed to measure the length of simulated and actual linear scars.
• Area measurements of simulated and actual patchy scars were performed using SL-3D scanning.
• Data were statistically analyzed and compared with results from soft rulers, vernier calipers, thin lines, and manual tracing methods.

Main Results:

• SL-3D scanning showed no statistically significant difference in length measurements compared to standard lengths for simulated linear scars.
• Measurements of simulated and actual patchy scars, even with high curvature and irregular shapes, demonstrated no significant difference from standard areas.
• High inter-observer (0.998) and intra-observer (1.000) reliability was observed for linear scar length measurements.
• SL-3D scanning results correlated highly (0.996) with the vernier caliper and thin line method.

Conclusions:

• SL-3D scanning effectively acquires three-dimensional scar information from body surfaces.
• Scar measurement accuracy using SL-3D scanning is independent of scar location, surface curvature, and human factors.
• SL-3D scanning offers accurate, reliable, and advantageous scar measurement capabilities, particularly for forensic applications.