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. Author manuscript; available in PMC: 2018 Feb 1.
Published in final edited form as: IEEE Trans Ultrason Ferroelectr Freq Control. 2016 Oct 20;64(2):374–390. doi: 10.1109/TUFFC.2016.2619913

Fig. 1.

Fig. 1

Normalized axial pressure amplitude distributions A/Amax for focused spherical transducers with (a), (c) the same and (b), (d) different F-number values. For normalization, Amax is the maximum value in the linear beam for a transducer of a given geometry. Here, a is the transducer radius, k is the wavenumber, F1,2,3 are the focal distances, and k(z–F1,2,3) is the dimensionless axial coordinate along the transducer axis shifted to the focal point. Examples are given for transducers with 1 MHz frequency and (a) a = 3, 4, 5 cm, F# = 0.9; (b) a = 5 cm, F# = 0.9, 1.2, 1.5.