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Fig. 3B —Tissue characterization by diffusion-weighted images. Diffusion-weighted MR images in 55-year-old man with liver metastasis obtained at different b values show large heterogeneous metastasis within right lobe of liver. Necrotic center of metastasis (squares) shows attenuation of signal intensity with increasing b values, indicating less restricted diffusion. By comparison, rim of tumor (rectangles) is more cellular and shows little signal attenuation with increasing b value.