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Projections at 0° with the filter placed (a) upstream and (b) downstream with respect to the phantom. Although, saturations of pixel value were observed on the upper left corner of each projection, only pixel values on dotted lines of each projections were extracted for the image reconstruction. Pixel profiles on the dotted line of projections for (c) upstream and (d) downstream filter placement. WL = window level, WW = window width.
