Fig. 3.

Representative signal for Method 1 (a) and Method 2 (b) of the same stone. Time (t) of interest was measured for the duration of Method 1 spike and the difference between the two spikes for Method 2. Note the t measured with Method 1 is roughly half that measured with Method 2 because the sound speed in stone (Method 1) is roughly twice that of the sound speed in water (Method 2). Reprinted with permission from Proceedings of the 2nd International Urolithiasis Research Symposium.¹⁰