Comparisons of tcol acquired from top- bottom- and side-mounted hydrophones for one 100-pulse treatment in a 1.0% agar phantom (Experiment 1) (A, B), one 100-pulse treatment in a 1.0% RBC phantom (Experiment 2) (C), and one 1000-pulse treatment (every third pulse) in an ex vivo bovine liver sample (Experiment 3) (D, E). The top-mounted hydrophone was blocked by the RBC phantom holder for Experiment 2, thus it could not be compared to the other two hydrophones. A strong, linear, direct correlation was observed in all comparisons, indicating that the tcol recorded on all three hydrophones were virtually identical.