Topographic distribution of pulmonary regional maximal standardized uptake value (SUV_max; g/ml) in three transverse regions of interest of equal height from the three groups (injury right group, injury left group, and control group) and for each lung side. Triangles and rectangles represent the individual median regional SUV_max for each animal. Positron emission tomography images in the coronal plane from three different animals (representing each group) illustrate the six region of interests that were used for the SUV_max calculation. Positron emission tomography–derived Ga-68 microsphere concentrations within the masks were color coded from relatively high (white) to low (black) and were normalized to the maximum concentration within the entire lung volume of each individual rat. a = apical; b = basal; L = left lung; m = medial; R = right lung.