TRUNK SURFACE DEFORMATION AND VOLUME MEASUREMENT DURING RESPIRATION USING A LIGHT PROJECTION SYSTEM

Abstract

This paper aim to measure trunk surface deformation and volume variation during respiration based on realistic 3D data obtained by means of a light projection system. For volume measurement, the trunk was represented as a polyhedron using QHULL method and the polyhedron volume was calculated for each instant of the respiratory cycle. Trunk surface deformation was obtained by means of contour maps and it variation during respiratory movement. The method was tested in one male health subject. Comparing the volume variation curve with the contour maps, it is possible to evaluate how the subject trunk deforms in order to produce this volume variation. In conclusion, the proposed method was able to measure trunk volumes and surface deformation during the respiration.