Human body surface area: measurement and prediction using three dimensional body scans

Area of Science:

• Anthropometry
• Biomedical Engineering
• Medical Imaging

Background:

• Traditional methods for determining body surface area (BSA) may lack precision.
• Advancements in 3D laser scanning and graphics software present an opportunity for improved BSA calculation.

Purpose of the Study:

• To evaluate the accuracy of 3D laser scanning for BSA determination.
• To develop and validate new, sex-specific regression equations for BSA prediction.
• To analyze surface area to volume (SA/VOL) ratios across different body segments.

Main Methods:

• Acquired raw whole-body 3D scans from 641 adults (395 men, 246 women).
• Restored scan surfaces and calculated BSA.
• Selected a subset (G24) for detailed hand surface area (SAhand) and SA/VOL measurements.
• Developed sex-specific non-linear regression equations for BSA prediction using body mass and height.

Main Results:

• Mean BSA: 2.03 m² (men) and 1.73 m² (women).
• Developed best-fit equations: BSA (cm²) = 128.1 × m⁰.⁴⁴ × h⁰.⁶⁰ (men) and BSA = 147.4 × m⁰.⁴⁷ × h⁰.⁵⁵ (women), with ~1.3% root mean square error.
• Women exhibited higher SA/VOL ratios than men in several body segments, including torso and limbs.
• SA/VOL ratios varied significantly across body regions, from ~12 m⁻¹ (pelvis) to 104–123 m⁻¹ (hands).

Conclusions:

• 3D laser scanning provides a potentially more accurate method for BSA determination.
• The derived sex-specific equations offer improved BSA prediction based on body mass and height.
• Observed differences in SA/VOL ratios highlight sex-based and regional variations in body shape and surface area.