Acoustic impedance of tissue.
D000162:Acoustics; D000818:Animals; D001932:Brain Neoplasms / Q000503:physiopathology; D004285:Dogs; D006801:Humans; D008103:Liver Cirrhosis / Q000503:physiopathology; D008113:Liver Neoplasms / Q000503:physiopathology; D008954:Models, Biological; D009362:Neoplasm Metastasis / Q000503:physiopathology; D011180:Postmortem Changes; D014159:Transducers; D014463:Ultrasonography