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Fig. 4B —Validation of simulation software for dose reduction. Pixel
noise is SD in Hounsfield units (average, 60 H) at region of interest obtained
in homogeneous portion of CT phantom. Graph shows relation between image noise
and dose reduction applied at CT scanner follows trend similar to that of dose
reduction simulated with software by mathematical addition of
gaussian-distributed quantum noise to raw CT data before image reconstruction.
Solid line with circles indicates CT scanner; dashed line with triangles,
simulation software.
