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Figure 1


Fig. 1 —Representation of noise index (NI) versus reconstruction slice thickness. CT profile data are acquired using 0.625-mm detector widths and reconstructed to 0.625-, 1.25-, 2.5-, 3.75-, and 5-mm slice thicknesses. Even though reconstruction slice thickness may vary, any slice thickness is generated from acquired 0.625-mm profile data. Thus, NI for any reconstruction slice thickness can be related back to NI for reconstructed 0.625-mm slice. For instance, NI = 40 at 0.625 mm equates nearly to NI = 33.8 at 1.25 mm and NI = 15.3 at 5 mm, each having same noise level ({sigma}) in acquired 0.625-mm profile data, though manifesting as different measured noise levels in reconstructed slices. ROI = region of interest.