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Figure 4b. Visual demonstration of the relationships between noise, dose, and pitch. Cardiac phantom images are shown for low and high pitch values. (a) Noncardiac images obtained at the same effective mAs have the same noise. (b) Cardiac images obtained at the same effective mAs do not have the same noise (but do have the same dose). (c) Conversely, cardiac images obtained at the same tube current–time product (not effective mAs) do have the same noise (but do not have the same dose). CTDIvol = Volume CT Dose Index, SD = standard deviation.
