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Attenuation properties and CNR calculations for the large phantom: positive iodine image contrast measured using CT number on (a) low-energy threshold images and (d) VMIs; CT numbers measured for DBCM and water on (b) low-energy threshold images and (e) VMIs; CNR (Iodine against DBCM and Iodine against water) calculated on (c) low-energy threshold images and (f) VMIs.
