. Author manuscript; available in PMC: 2019 Dec 30.

Published in final edited form as: IEEE Trans Ultrason Ferroelectr Freq Control. 2019 Jun 24;66(9):1453–1464. doi: 10.1109/TUFFC.2019.2924351

TABLE II.

Transducer and Wave Properties

Frequency (MHz)		1.45	1.53	3.91
Diameter (mm)	Geometrical	100	100	25
Diameter (mm)	Effective	100 ± 3	83 ± 1	17 ± 1
Focal Length (mm)		100	150	25
Spectral Index SI		0.42 ± 0.01	0.34 ± 0.01	0.41 ± 0.01
Nonlinear propagation parameter σ_m		2.45 ± 0.06	2.30 ± 0.03	2.44 ± 0.07
Local distortion parameter σ_q		3.79 ± 0.06	2.97 ± 0.01	2.89 ± 0.05
Exponent q (σ_n = σ₁ / n^q)	n =1-5	0.72 ± 0.01	0.64 ± 0.03	0.59 ± 0.01
Exponent q (σ_n = σ₁ / n^q)	0-40 MHz	0.60 ± 0.01	0.50 ± 0.03	0.53 ± 0.01
Focal pressure (MPa)		48.7 ± 0.3	16.2 ± 0.4	29.4 ± 0.4