Fig. 1From: Positional effects on the distributions of ventilation and end-expiratory gas volume in the asymmetric chest—a quantitative lung computed tomographic analysisSchematic images in all horizontal positions and their respective anatomical and regional demarcations. I Supine and II prone, where quadrants were defined as non-PLEF dorsal (A), non-PLEF ventral (B), PLEF dorsal (C), and PLEF ventral (D). III Lateral position with “dependent pleural effusion,” where quadrants were defined as non-PLEF, non-dependent dorsal (A); non-PLEF, non-dependent ventral (B), PLEF-dependent dorsal (C), and PLEF-dependent ventral (D). IV Lateral position with “non-dependent pleural effusion,” where quadrants were defined as non-PLEF, dependent dorsal (A); non-PLEF, dependent ventral (B); PLEF, non-dependent dorsal (C); and PLEF non-dependent ventral (D). PLEF pleural effusion. Asterisk denotes anatomical distribution of PLEF. Note that the quadrant-demarcating (anatomic) ventral surfaces of the left and right main bronchi shifted in the two lateral positions. Also refer to Additional file 1 for representative chest CT images of each studied conditionBack to article page