FIG. 2.

(a) Custom handheld BWL and ultrasonic propulsion probe with a water-circulating coupling head. The therapy probe (black/silver, peripheral) is a single element annulus that supports coaxial alignment of a P4-2 imaging probe (red, central). The overall probe diameter (SC-60) is 6.5 cm. (b) User interface demonstrating real-time imaging. The upper right panel displays the B-mode image. The red oval represents the treatment focus, where a stone must be aligned for treatment to be effective. The upper left panel displays the customized “S-mode” image,^12,13 utilizing color-flow Doppler to make the stone stand out in green. The bottom panel includes the system settings and system feedback parameters for monitoring operation. Pulses are triggered with a footswitch.