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Figure 4
Sinograms of NPG. (A) Original and (B) after rapid alignment and forward projection (number of iterations: 40). Zoomed-in views of (A) and (B) are shown in (C) and (D), respectively, where the arrows point at well-corrected sample features, which improve the continuity of the sinogram. The images are displayed on a 32-bit grey-level scale. [Note that the rapid alignment shifts the projection images also in the z-direction, thus the data shown in the sinogram of row i in (A) and (C) will be different from that after registration, as shown in (B) and (D). Hence, the `exact' sinogram i no longer exists, and instead a slightly modified sinogram has been created. However, key features in the non-aligned and aligned sinograms can still be traced for comparison as highlighted by the white arrow heads.]

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