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High-pass filtering was performed along the transverse direction to separate moving and stationary scatterers. (a) Real-valued filter kernel used for high-pass filtering and (b) Fourier transform of the filter kernel, or frequency response, for protocol 1 (0.95 µm / axial scan). (c) Filter kernel and (d) frequency response for protocol 2 (0.025 µm / axial scan).
