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Procedure for rotating each BV and body segmentation map into a canonical orientation. The first Principle Component (PC) of BV and the first PC of body are used (indicated as dash line in (a)). The up-down direction (dash arrow in (a)) is determined by the comparative centroid positions of BV and body. The front-back direction (dash arrow in (b)) is determined by the structural characteristic of BV because the front BV region is wider than the back BV region (solid line in (b)).
