TABLE III.

Comparison of lithotripter parameters calculated from experimental and numerical pressure profiles at the focus for the new 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	15.8	38.2	−8.3	1.82	3.11	51.8
	16.8	42.2	−9.0	1.80	3.13	18.6
Numerical	15.8	36.7	−6.6	1.80	3.07	44.7
	16.8	38.7	−7.3	1.89	3.24	40.9

	Source voltage (kV)	Beam width (mm)	$E_{+1}$ (mJ)	$E_{-1}$ (mJ)	$E_{+2}$ (mJ)	$E_{\text{total}}$ (mJ)
Experimental	15.8	10.4	29.9	9.8	0.0	39.9
	16.8	10.8	38.7	12.1	0.0	51.3
Numerical	15.8	10.0	27.5	7.7	0.1	35.6
	16.8	10.7	34.0	9.4	0.1	43.9