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The methods for calculating APDT and TDT. The mediastinal APDT was defined as the maximum diameter between posterior rim of the sternum and anterior rim of the vertebra (green arrow). The thoracic APDT was defined as the maximum anteroposterior diameter of the thoracic cage (yellow arrow). The TDT was defined as the maximum diameter of the transverse diameter of the thoracic cage (red arrow). APDT, anteroposterior diameter; TDT, transverse diameter.
