We discuss a simple method for automatic recognition of pulmonary emphysema in three-dimensional computer tomography (CT) images. This technique allows one to quantify the disease progress, calculating some numerical characteristics, such as the percentage of the lung tissue affected, as well as visualizing its location and intensity histogram in the region of interest. An experiment on the test data shows that the recognition error is not higher than 7.5%.

The article proposes a method for measuring the volume of the injured regions of human lung tissue on CT scan based on the volume of healthy lung tissue subtraction from the total lung volume in the absence of pathology. The total lung volume is calculated on the base of the regression model using a combination of linear metrics produced manually. The volume of healthy lung tissue is determined using adaptive thresholding. Experimental studies have shown that the error of the proposed technique does not exceed 10% in comparison with ground true evaluation made by expert. This technique is useful for the case of large injury, when accurate lung segmentation is impossible.