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Fig. 2 | Respiratory Research

Fig. 2

From: Quantitative CT-based image registration metrics provide different ventilation and lung motion patterns in prone and supine positions in healthy subjects

Fig. 2

Demonstration of inspiratory (a and d) and expiratory (b and e) tissue fraction (TFIN and TFEX, respectively) maps and local expansion (J) map (c and f) in supine (a-c) and prone (d-f) positions. TFIN, TFEX, and J were computed in local lung parenchymal volumetric units at an acinar scale and were colored according to a rainbow scale. TFIN and TFEX are plotted in the same scale for comparison between inspiration and expiration. Since the summation of both air and tissue fractions is equal to unity, the decrease in tissue fraction implies an increase in air fraction. J is computed as inspiratory-to-expiratory volume ratio at matched parenchymal units

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