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Patient-based correction of the H/M ratios obtained with non-ME (A, LEAP; B, SLEHR; C, LME; D, CHR) collimators. The values before correction (green square), after empiric correction (blue circle), and after combined correction (red triangle) were plotted against the uncorrected values obtained with the ME collimator. The broken line indicates the line of identity. Results of linear regression are shown
