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Figure 8: Plots of the true unscatter counts against the estimated unscatter counts of the photopeak window. Each point corresponds to a pixel (i,j) and solid line corresponds to the linear fitting between true US(i,j) and estimated US(i,j). The Rsquare is statistic parameter that measures how successful the fit is in explaining the variation of the data. A value closer to 1 indicates a better fit 
