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Fig. 2D —Graphs of noise index (NI) data from Table 1. NI data plotted versus relative dose for five reconstruction slice thicknesses: 0.625 (black), 1.25 (red), 2.5 (blue), 3.75 (brown), and 5.0 mm (green). NI graph illustrates importance of increase in relative radiation dose when reconstruction slice thickness is changed without changing NI. What happens to dose if same NI of 20 is kept when changing reconstruction slice thickness from 5 to 0.625 mm? At NI of 20 and reconstruction slice thickness of 5 mm, relative radiation dose is 0.6 (dotted line). At same NI of 20 but changing reconstruction slice thickness to 0.625 mm, relative radiation dose changes to 4.0 (solid line), thereby increasing dose by factor of 6.7 times, if maximum mA has not been reached.