Eighty-three patients with 100 histologically diagnosed hepatocellular carcinomas (HCCs) who preoperatively underwent diffusion-weighted (DW) imaging at any of 6 institutes were retrospectively studied. Receiver-operating characteristic analysis revealed that quantitative measurements such as the relative contrast ratio (RCR) and the contrast-to-noise ratio (CNR) between lesion and liver parenchyma on DW images were superior to the apparent diffusion coefficient (ADC) in predicting poorly differentiated HCCs, and intraclass correlation coefficients for the RCR tended to be greater than for the CNR and the ADC.
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