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The 1-kg neonate in the LLD position with viscosity µ = 30 cP, dose volume of 1 mL, and flow rate of 6 mL/s. The airway tree is symmetric with eight generations plus trachea, 256 acini. The efficiency index is η = 52.8%. (A) Front view. (B) Top view of the 3D model with color-coded amounts percentages in the acini. (C) Normalized delivery VN(i) plotted vs. i = 1–256 acini. (D) Histogram showing homogeneity index is 1/SD = 4.9. See text for definitions.
