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The distribution of computed tomography (CT) numbers in detail from the two 4-dimensional CT axial slices on the right. The 2 reconstructions are from the same 4-dimensional CT data set, time sorted to the 0% expiration phase. The scan parameters are identical to those used to produce Figure 3. The image in the middle is the standard filtered back projection reconstruction (B30f), and the image on the right is the SAFIRE 5 reconstruction (I30f#5).
