Lung parenchyma, airway and background have low CT numbers,so a mean value of two peaks (lung parenchyma, airway and fat) is used to binarize the images. After image binarization, 2D hole filling algorithm is used and the thorax is extracted by searching the largest connected components.
MATLAB: Matlab code for 2D hole filling algorithm
2d hole filling algorithmlargest connected componentslung
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