CEUS contrast-enhanced ultrasound COPD chronic obstructive pulmonary disease CT computed tomography CXR chest x-ray DUS diaphragm ultrasound EBUS-TBNA endobronchial ultrasound-guided transbronchial needle aspiration EUS-FNA endoscopic ultrasound fine-needle aspiration FoCUS focused cardiac ultrasound LUS lung ultrasound MRI magnetic resonance imaging PET positron emission tomography PoCUS point-of-care ultrasound TUS thoracic ultrasound US ultrasound List of abbreviations