FIG. 3.

The lateral distribution of peak positive pressure (P⁺) for the TRT LG-380 (at PL-9), the Dornier HM3 (at 18 kV), and Storz-SLX (PL-9) lithotripters. Measures were in the plane of the treatment focal point of each lithotripter (target point for LG-380, F2 focal point for HM3, focus of SLX). The focal width (i.e., −6dB width; pressure half maximum amplitude; radius indicated by intersection of dashed lines with x-axis) was ∼20 mm for the LG-380, ∼8 mm for the HM3, and ∼2.6 mm for the SLX. Data points are averaged values for at least 10 SWs collected at steps lateral to the axis of SW propagation.