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Ensemble-averaged (Ens.) CV for each group of VOIs evaluating reproducibility of estimated doses across all considered scanner–collimator configurations (A), 3 scanners with high-energy general-purpose collimator (B), and 3 collimators with Optima 640 scanner (C). Error bars show standard error (SE) of ensemble-averaged CVs. *P < 0.01. BKGD = background; LI = large intestine; SI = small intestine.
