Figure 4.

Images of the 3.2 mm steel rod using full and reduced aperture data, corresponding to expected loss of resolution. Reconstructions by SAFT using (a) full aperture, (c) 6.25% reduced aperture, and (e) 3.5% reduced aperture. Reconstructions by the SDUI method using (b) full aperture with ${\lambda }_1=500$, ${\lambda }_2=100$, (d) 6.25% reduced aperture with ${\lambda }_1=170$, ${\lambda }_2=5$, and (f) 3.5% reduced aperture with ${\lambda }_1=150$, ${\lambda }_2=3$. All dimensions are in millimeters.