Digital anthropometric (DA) measurements are increasingly being acquired with three-dimensional (3D) optical devices in health and fitness studies. Data sets collected across centers often cannot be pooled as specific anatomic measurement locations are manufacturer specific. This study develops a universal 3D scan analysis software that produces device-independent DA measurements. In our previous study, we implemented and validated DA lengths and circumferences. In this study, we extend the universal software to calculate DA volumes.
We used Matlab (Mathworks, Natick, MA) to develop software that automatically locates anatomic points on a 3D scan, partitions the scan into right/left arms, right/left legs, trunk, head and neck (head_neck), and calculates total and regional body volumes. 256 subjects completed evaluations by a DXA and a Bodpod device as well as the 3D optical Styku scanner [Styku, Los Angeles, CA]. A subset including 91 participants completed evaluations by the 3D optical SS20 scanner [Size Stream, Cary, NC]. Total body volumes were validated against total body volumes calculated using DXA and BodPod. Regional body volumes were validated against regional volumes calculated using DXA.
Total body volumes were highly correlated with both DXA and BodPod (r-squared≈1). Leg and arm volumes were highly correlated with DXA (r-squared≈0.8 and r-squared≈0.7, respectively). As expected, head_neck volume was weakly correlated with DXA (r-squared≈0.5), since DXA does not include neck but only the head.
Overall, our findings support the development of 3D optical scan software that provides manufacturer-independent DA volume measurements based on evaluation made against DXA and BodPod.