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The areas of GGO were measured at five locations (the top of aortic arch, AP window, LUL bronchus, right inferior pulmonary vein and the top of left diaphragm respectively) using the measurements of the free-pen tool of PACS. To calculate the percents of lung injury, the sum of the areas of GGO (A) at the five levels were divided by the sum of the area of the total lungs (B) at the respective levels.
