Fig. 4.

In vitro temperature measurements in canine liver at 3.1 MHz and 3-s pulse duration using 3 different thermocouples: needle T-type with 0.64 mm (N64), needle T-type with 0.25 mm diameter (N25), and wire T-type with 0.30 mm diameter (W30). (a)(b)(c) Temperature variation measured at different peak-negative-pressures. (d)(e)(f) Temperature variation measured with different pulse repetition frequencies. (g)(h)(i) Temperature variation measured at different locations following the beam lateral profile (0.00 mm, 0.19 mm, 0.30 mm, 0.50 mm, 0.75 mm, 1.00 mm, 1.25 mm, and 1.50 mm).