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. Author manuscript; available in PMC: 2018 Nov 1.
Published in final edited form as: IEEE Trans Ultrason Ferroelectr Freq Control. 2017 Aug 31;64(11):1684–1697. doi: 10.1109/TUFFC.2017.2748050

Fig. 4.

Fig. 4

The peak-negative pressure time-of-flight measured by the catheter hydrophone (Cath. Hyd.) compared to that measured with a PVDF capsule hydrophone (Cap. Hyd.). (a) shows the position of each hydrophone within the array used to measure the (b) time-of-flight of each waveform. (c) Delays in the catheter hydrophone measurement relative to the capsule hydrophone were calculated by subtracting those measured with the capsule hydrophone. (d) The measurement was repeated after flipping the catheter hydrophone 180° with respect to the array.