Table 1 Overview of quantitative imaging features and their descriptions.
Features | Name | Description |
|---|---|---|
HU based characteristics | Mean | Mean value of the distribution of HU values in a ROI. |
Standard deviation | Standard deviation of the distribution of HU values in a ROI. | |
Kurtosis | Kurtosis of the distribution of HU values in a ROI. | |
Skewness | Skewness of the distribution of HU values in a ROI. | |
Gas volume | Gas volume of a ROI (in \(\:{mm}^{3}\)) according to formula (3). | |
Water volume | Water volume of a ROI (in \(\:{mm}^{3}\)) according to formula (4). | |
Tissue weight | Tissue weight of a ROI (in g) according to formula (5). | |
Relative position of the center of mass; transversal | Position of the HU-weighted center of mass of a ROI along the transversal axis from right to left, relative to the boundary of the lung mask. | |
Relative position of the center of mass; sagittal | Position of the HU-weighted center of mass of a ROI along the sagittal axis from ventral to dorsal, relative to the boundary of the lung mask. | |
Relative position of the center of mass; longitudinal | Position of the HU-weighted center of mass of a ROI along the longitudinal axis from caudal to cranial, relative to the boundary of the lung mask. | |
Geometric characteristics | Volume | Volume of a ROI (in \(\:{mm}^{3}\)) according to formula (1). |
Transversal dimension | Spatial dimensions of a ROI (in \(\:mm)\) along the transversal axis. | |
Sagittal dimension | Spatial dimensions of a ROI (in \(\:mm)\) along the sagittal axis. | |
Longitudinal dimension | Spatial dimensions of a ROI (in \(\:mm)\) along the longitudinal axis. |
