The distribution of ventilation evaluated by EIT in different postures.

(a) EIT images of FVC, fEIT images of pixel FEV1/FVC, Histograms and global MI, and regional MIs in four quadrants obtained in a healthy subject in sitting (top) and supine (bottom) posture. (b) Regional obstruction in the contour-map ROI and the changes of the histogram in the four-quadrant ROIs in sitting and supine postures. Dashed lines show the global and regional MIs. (c) Global and regional MIs (mean±SD) of all healthy subjects in sitting and supine postures. The image orientation is the following: ventral is at the bottom and the right side of the body is on the left of the image. FEV1, forced expiratory volume in 1 second; FVC, forced vital capacity; RiVe, right ventral; LeVe, left ventral; RiDo, right dorsal; LeDo, left dorsal.