title: Nonlinear ultrasonic propagation in biological media.
abstract: The nonlinearity parameter B/A for several biological materials was determined by measuring the amplitude of the second harmonic pressure as a function of distance from the source and the amplitude of the fundamental at the source. The B/A values for bovine serum albumin and haemoglobin solutions were found to increase approximately linearly with solution concentration. Blood and homogenized liver exhibit a B/A value similar to a haemoglobin solution of the same dry weight, but whole liver has a greater B/A value.
mesh_terms: D006454:Hemoglobins; D008099:Liver; D008954:Models, Biological; D012710:Serum Albumin, Bovine; D014465:Ultrasonics
chemical_list: D006454:Hemoglobins; D012710:Serum Albumin, Bovine