FIG. 4.

Visual comparison of the original fast spin echo scans in three orthogonal slice acquisition directions in (a)–(c), with (d) and (e): image domain super-resolution reconstructed scans with rectangular and Gaussian slice profiles, respectively, (f): SRR in the frequency domain, (g) and (h): wavelet fusion with Haar and reverse biorthogonal wavelet basis functions, respectively, and (i) the original high-resolution scan used as the reference scan here. This comparison indicates that image fusion techniques can generate images that delineate fine structures of the images when compared to the original scans; but there are also differences between these techniques, for example, the pinhole structures are better highlighted in (e) when compared to (d) but image edges in the structure at the top of the image are better reconstructed in (d). It is hard to conclude which technique performed best.