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. Author manuscript; available in PMC: 2022 Jul 1.
Published in final edited form as: IEEE Trans Ultrason Ferroelectr Freq Control. 2021 Jun 29;68(7):2419–2431. doi: 10.1109/TUFFC.2021.3065952

Fig. 4.

Fig. 4.

Single LF element transmit pressure field (a) simulated by Field II using the physical width of the LF element (0.73 mm), and (b) measured output from element 16 of the LF array. Pressure is normalized to the on-axis peak value at each depth. The red continuous line is the −6 dB contour. The red dashed line is the axis of the array element; profiles are displayed at a dynamic range of −6 dB. (c) The LF waveform and its spectrum acquired on axis, at a depth of 3.6 mm below the probe surface, for a single cycle transmit pulse at 1.9841 MHz. (d) Center frequency of all elements with their respective upper and lower bound −6 dB frequencies; and (e) pressure measured on axis of individually excited LF elements at a depth of 3.8 mm below the probe surface.