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Relationship between heart-to-mediastinum ratio (HMR) and conversion coefficient (CC) using the HMR threshold of 1.6. For example, HMR = 1.6 with a LEHR collimator (CC = 0.55) can be interpreted as 1.9 with the LME collimator (CC = 0.83). Low-energy general-purpose (LEGP) + all-purpose (AP) groups show variable results between Japan (J) and Europe (E). See also average CC in Fig. 3
