Fig. 10.

(a) B-scan images (simulated data set) of nine targets (spheres) located at different depths from the focus. These include the sinogram (raw data), SAFT image, SIR+SAFT image, CF+SAFT image, and CF+SIR+SAFT image. Figure reproduced with permission from [70] © The Optical Society. (b) Hyperbolic function used as the binary weighting mask of SIR (red line) [75]. $a$ and $a_f$ are the half widths of the minimized and maximized acoustic spreading functions, respectively; $z_f$ represents the depth of the focal point (VD). Figure reproduced with publisher’s permission [75]. Copyright (2018) The JapanSociety of Applied Physics. (c) Linear function used as the binary weighting mask of SIR (black line). w is the width of the UST; $∆x$ indicates the scanning step of the UST between adjacent A-lines; $\mathrm{z}$ is the depth of the synthesized imaging point.