title: The use of gas as a contrast agent for abdominal ultrasound.
mesh_terms: D000328:Adult; D003287:Contrast Media; D005740:Gases; D006801:Humans; D008115:Liver Regeneration; D008297:Male; D013272:Stomach Diseases / Q000175:diagnosis* / Q000209:etiology; D014463:Ultrasonography
chemical_list: D003287:Contrast Media; D005740:Gases