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FIGURE 3. Recovery coefficients for various ROIs. = maximum pixel value; = ROI⁷⁰; • = ROI^0.5(BG+MAX); = ROI⁵⁰. A and C represent data for TBR = 2; B and D represent data for TBR = 8. (A and B) Nonsmoothed data. (C and D) Smoothed data. SEs varied from 9% to 4% and from 5% to 2% for 10- to 30-mm spheres for all ROI methods for nonsmoothed (A and B) and smoothed data (C and D), respectively.

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