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Fig. 2 | Respiratory Research

Fig. 2

From: Volumetric characteristics of idiopathic pulmonary fibrosis lungs: computational analyses of high-resolution computed tomography images of lung lobes

Fig. 2

Mean and skewness values of Hounsfield units (HU) of lungs in their expanded (left panel) and contracted (right panel) states for healthy (N = 13) and idiopathic pulmonary fibrosis (IPF) subjects (N = 9). We computed these values from the HU histograms shown in Fig. 1. (a) HU means averaged for the healthy and IPF groups. (b) Individual root-mean-squared difference (RMSD) values of the HU mean. (c) HU skewness values averaged for the healthy and IPF groups. (d) Individual RMSD values of HU skewness. In a and c, the error bars denote one standard deviation and the asterisks indicate different levels of statistical significance for differences in the mean values between the two groups. In b and d, the error bars denote one standard deviation computed from 13 iterative leave-one-out validations (See Methods Section). RU denotes the right upper and right middle lobes combined. RL, LL, and LU denote the right lower, left lower, and left upper lobes, respectively

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