Fig. 1

Ultrasound images of end-inspiratory diaphragm thickness and end-expiratory diaphragm thickness. (A) Diaphragm thickness at the end of inspiration (Dtei); (B) Diaphragm thickness at the end of exhalation (Dtee). The green dashed line represents the visceral pleura and the blue dashed line represents the parietal pleura (in Fig. 1A). The parallel high echo light band near the probe side is the parietal pleura, while the parallel high echo light band far from the probe side is the visceral pleura. The low echo structure located between the parietal pleura and visceral pleura is the diaphragm (in Fig. 1B)