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. Author manuscript; available in PMC: 2011 Feb 4.
Published in final edited form as: Proc SPIE Int Soc Opt Eng. 2004;5368(2):534–541. doi: 10.1117/12.534568

Figure 5.

Figure 5

Reconstructed slices for large ROI. All the four images were normalized to have same window level, a) Outside ROI set to zero in the projection image, b) Outside set to the estimated value, c) Dose level outside ROI = 1/256 of its original value, d) Dose level outside = 1/16 of its original value.