Fig. 2
From: Three-dimensional substructure measurements for the differential diagnosis of ground glass nodules
Example of a nodule visualized using computed tomography (CT), CT number histogram and three-dimensional model. a A ground-glass nodule (GGN) located in the upper lobe of left lung (blue arrow). The peak (blue arrow) CT number in the histogram was −804 HU and the maximum CT number measured automatically in the three-dimensional reconstructive model was −41 HU (white box). b The same GGN redetected after a 3-month follow-up (blue arrow). The peak (blue arrow) CT number had increased to −789 HU and the maximum CT number had increased to −32 HU (white box)