Fig. 4From: A cross-sectional survey on the lung ultrasound training and practice of respiratory therapists in mainland ChinaA When to use LUS? B Can you identify these LUS signs? LUS, Lung ultrasound; SBT:Â spontaneous breathing trial; CPT: chest physiotherapy; NIV:Â non-invasive ventilation; FOBÂ fiber bronchoscopy; HFNC:Â high-flow oxygen therapy Back to article page