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Fig. 2C —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 shows how to maintain
constant radiation dose as reconstruction slice thickness is changed. For
operator-selected 5-mm reconstruction slice thickness and NI of 12, how would
NI change if reconstruction slice thickness was modified to 0.625 mm while
maintaining same radiation dose? It can be seen that for NI of 12 and 5-mm
reconstruction slice thickness, maintaining same relative radiation dose of
1.7 (dotted line) when changing to reconstruction slice thickness of
0.625 mm (solid line) requires change in NI from 12 to 31.
