TABLE II.

Comparison of lithotripter parameters calculated from experimental and numerical pressure profiles at the focus for the original lens design. Energy subscripts $+1$, $-1$, and $+2$ refer to the first compressive, first tensile, and second compressive wave, respectively. $R_h=6$ mm was used for all pulse energy calculations.

	Source voltage (kV)	$P_{+}$ (MPa)	$P_{-}$ (MPa)	$t_{+}$ ($\mu \mathrm{s}$)	$t_{-}$ ($\mu \mathrm{s}$)	$t_r$ (ns)
Experimental	13.8	46.3	−10.2	1.62	3.49	145.0
	15.8	56.4	−11.0	1.59	3.31	16.2
Numerical	13.8	45.2	−8.9	1.57	3.40	50.2
	15.8	52.2	−10.6	1.63	3.69	37.3

	Source voltage (kV)	Beam width (mm)	$E_{+1}$ (mJ)	$E_{-1}$ (mJ)	$E_{+2}$ (mJ)	$E_{\text{total}}$ (mJ)
Experimental	13.8	7.4	33.2	17.2	1.5	53.2
	15.8	7.5	51.7	18.3	4.3	74.7
Numerical	13.8	7.6	30.1	13.5	1.6	45.3
	15.8	8.3	48.0	20.3	2.8	71.5