Figure 1

Reconstruction results of three different methods. 1(a), (b), (c) original images from 47 kHz, 188 kHz, and 376 kHz acquisitions; 1(d), (e), (f) reconstructed images from 47 kHz, 188 kHz, and 376 kHz acquisitions using DT-CWT; 1(g), (h), (i) reconstructed images from 47 kHz, 188 kHz, and 376 kHz acquisitions using BM3D; 1(j), (k), (l) reconstructed images from 47 kHz, 188 kHz, and 376 kHz acquisitions using NCHR. We can clearly observe the increase in noise level associated with higher scanning speeds. Our proposed method (NCHR) is able to suppress most of the noise while still preserving boundary and details, at the same time without losing any important structures. The green and blue line boxes in the original normal speed image mark regions which we used for perform quantitative comparison of all the processed images by different algorithms.