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. Author manuscript; available in PMC: 2009 Jan 23.
Published in final edited form as: IEEE Trans Nucl Sci. 2008 Oct;55(5):2566–2575. doi: 10.1109/TNS.2008.2004557

Figure 4.

Figure 4

Illustration of one slice of the volume image: (a) from the normal dose scan (the arrow indicates the position of the polyp); (b) from standard FBP reconstruction of the re-projected normal dose projection data (i.e., Figure 2(a)); (c) from standard FBP reconstruction of the simulated ultra low-dose projection data (i.e., Figure 2(c)); (d) from conventional FBP reconstruction of the simulated ultra low-dose projection data, where the Hanning window had a cutoff at 80% Nyquist frequency; and (e) from standard FBP reconstruction of the simulated ultra low-dose projection data after the KL-PWLS sinogram noise reduction was applied. The displays are in the full range from zero to maximum voxel intensity respectively.