Fig. 2
From: Ultrasound and non-ultrasound imaging techniques in the assessment of diaphragmatic dysfunction
Reproduced with permission from The American Association for Respiratory Care: Shaikh et al. Respir Care 2019;64:1600–2. The entirety of both images was obtained by Dr. Shaikh
Ultrasound image of the zone of apposition of the diaphragm. In brightness-mode (B-mode; left panel), the diaphragm appears as a three-layer structure. In motion-mode (M-mode; right panel), the diaphragm is thinnest at end-exhalation and thickest at end-inhalation; stronger diaphragmatic inspiratory efforts are associated with greater tidal thickening of the diaphragm.