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This study validates the use of smartphone-based photogrammetric scanning for automated anthropometric measurements by comparing the PolyCam application with the commercial Fit3D ProScanner across 144 pregnant participants. Using a linear mixed-effects model, the researchers found that PolyCam exhibited strong agreement with Fit3D, with biases under 16 mm and high correlation coefficients, indicating its reliability for longitudinal body-shape monitoring. Additionally, mannequin tests confirmed PolyCam's accuracy with mean biases below 3.5 mm, suggesting its potential as a cost-effective alternative for 3D body scanning in healthcare settings.
Smartphone photogrammetry can match commercial body scanners in accuracy, making 3D body scanning more accessible for healthcare applications.
3D body scanning has become an important tool in healthcare applications because of its rapid and non-invasive nature. While smartphone-based photogrammetric reconstruction provide a low-cost and accessible alternative to commercial 3D body scanners, their performance for whole-body scanning remains insufficiently validated. Thus, we designed this study to comprehensively validate the photogrammetric 3D scanning application by evaluating automatically extracted whole-body measurements and longitudinal body-shape monitoring. We evaluated a representative application, PolyCam, against the commercial depth-sensor-based Fit3D ProScanner using 144 pregnant participants scanned longitudinally throughout pregnancy. We designed an automatic circumference extraction pipeline to get measurements at four anatomical landmarks from paired 3D scans. A linear mixed-effects model was used to evaluate scanner effects and longitudinal body-shape changes. Measurement consistency was assessed using repeated PolyCam scans and tape measurements on a rigid mannequin. PolyCam demonstrated strong agreement with Fit3D, with average biases below 16 mm, intraclass correlation coefficients above 0.8, and Pearson correlation coefficients above 0.9 across all landmarks. Both systems captured comparable longitudinal body-shape changes. Mannequin experiments showed mean biases below 3.5 mm and no significant differences from tape measurements. These findings support smartphone photogrammetry as a potential accessible alternative to commercial body scanners and applicable for longitudinal 3D body-shape assessment.
