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. Author manuscript; available in PMC: 2022 Jan 15.
Published in final edited form as: Med Phys. 2019 Jun 23;46(8):3414–3430. doi: 10.1002/mp.13599

FIG. 8.

FIG. 8.

Box-whisker plots presenting phantom experiment results in evaluation of IC for the correction of cupping, capping, and cone beam HU drop artifacts in addition to HU miscalibration for a 15.2 cm (top row), 12.7 cm (middle row), and 10.2 cm (bottom row), 12.7 cm (middle row), and 10.2 cm (bottom row) diameter polyethylene phantom. In each of the 6 plots, the leftmost “Box” edge represents the first quantile boundary, the vertical line inside of the box represents the median, and the rightmost edge represents the third quantile boundary. The left and right columns show the results of using IC in cupping and capping cases, respectively, across phantom sizes. The change in the average HU band values along the axial axis is demonstrated through the size of each box. In each case, the quantile variance is reduced (the box width shrinks) after flat fielding, indicating a correction of HU change in axial direction.