Fig. 6.

B-scans of a polymer-layered phantom with 2.4cm water induced dispersion; (a) original image obtained by applying NUDFT to 100% of the acquired non-linear wavenumber spectra; (b) CS reconstruction result with the NUDFT matrix from 50% of the acquired non-linear wavenumber spectra; (c) CS reconstruction result with the MNUDFT matrix from 50% of the acquired non-linear wavenumber spectra; (d) image obtained by applying the forward MNUDFT matrix to 100% of the acquired non-linear wavenumber spectra. The scale bars represent 100μm. Image size in pixel is 450 × 1000.