Figure 2 | Scientific Reports

Figure 2

From: All-Optical Rotational Ultrasound Imaging

Figure 2

(a) Transmitted ultrasound time-series, measured at 1.5 mm and (b) the corresponding ultrasound power spectrum, with frequency-filtered power spectra used for the depth-dependent filtering shown (blue dashed line: 5 MHz cut-off; red dotted line: 10 MHz cut-off; green dot-dash line: 15 MHz cut-off). (c,d) Transmitted ultrasound beam profiles measured with a hydrophone positioned (c) within a plane parallel to the optical fibre axis (red solid line: FWHM) and (d) within a plane perpendicular to the optical fibre axis (colour bar in MPa) with measurements performed at 1 mm from the optical fibre tip. (e) Schematic of the optical fibre ultrasound transmitter tip with the coordinate system corresponding to beam profiles shown in (c,d).

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