Figure 3 | Scientific Reports

Figure 3

From: All-Optical Rotational Ultrasound Imaging

Figure 3

(a–d) Rotational optical ultrasound images of a custom 27 µm tungsten wire phantom with different frequency filters: (a) 0.5 MHz cut-off, (b) 10 MHz cut-off, (c) 20 MHz cut-off, (d) depth-dependent filter (30 dB dynamic range). (e) Axial and (f) angular ultrasound resolution for the rotational optical ultrasound (OpUS) imaging probe (Red ×: 0.5 MHz cut-off; blue + : 10 MHz cut-off; green *: 20 MHz cut-off; black o: depth-dependent filter), as measured from the images shown in (ad).

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