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Fig. 3C —Noise field images of CT dose index phantom obtained by subtraction
of two consecutive images. Process removes correlated phantom features and
leaves uncorrelated image of noise. Method allows measurement of noise over
large region without interference of phantom structures. CT scans with phantom
centered 30 mm (B) and 60 mm (C) below gantry isocenter.
Increase in image noise (inferior aspect of phantom, B and C)
and surface and peripheral CT dose index is evident with off-centering of
phantom.
