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. Author manuscript; available in PMC: 2013 Feb 1.

Published in final edited form as: Ultrasound Med Biol. 2011 Dec 16;38(2):296–311. doi: 10.1016/j.ultrasmedbio.2011.10.026

(a) Experimental setup for the pressure measurement. (b) Peak positive pressure as a function system power setting. (c) Peak negative pressure as function of system power setting. (d) Calculated MI as function of system power setting. FDA safely level of 1.9 is shown as a line. (e) I_spta for normal and axicon mode focusing with the safety recommendation of 720 mW/cm² marked by a line.

(a) Experimental setup for the pressure measurement. (b) Peak positive pressure as a function system power setting. (c) Peak negative pressure as function of system power setting. (d) Calculated MI as function of system power setting. FDA safely level of 1.9 is shown as a line. (e) I_spta for normal and axicon mode focusing with the safety recommendation of 720 mW/cm² marked by a line.