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Curvature correction based on curve fitting on the cylindrical phantom with data (letters). Intensity images are shown before and after curvature correction. Different contrast agents were used with decreasing data-to-background ratios. The different Id∕Ib ratios are (a) 0.73, (b) 0.51, and (c) 0.39. The figure qualitatively shows the dependence of data-to-background ratio on the correction performance.
