Fig. 2.
Analysis of geometric center of the lungs (GCLung) and ventilation defects (GCVdef). Left: projections of Vdefs (in red) for subjects in the prone position; right: same subjects in the supine position. The white cross represents the GCLung, and the orange cross is the GCVdef. There are three views of the lung in each image (clockwise from top left): transverse viewed caudo-cranially, sagittal, and coronal. In these images, Vdefs that deviate toward the bottom of the page result in negative distances between GCLung and GCVdef in the transverse, sagittal, and coronal planes.