Fig. 1
Typical examples of two-colour index maps. Combined index maps IDf are given in comparison to index maps IADC together with ID and If, overlaid to b-800 images, for (a) FNH together with two haemangiomas (blue x), (b) HCC, (c) CCC together with bilioma (red x), and (d) metastasis from colorectal carcinoma (CRC). The FNH reveals almost everywhere voxels with perfusion fraction above cutoff (If green) so that IDf shows clear benignity despite diffusion coefficient below cutoff (ID red), IADC showed slightly less green voxels compared to IDf (79% versus 92%). The haemangiomas shows almost everywhere voxels with diffusion coefficient above cutoff (ID green), so that IDf shows clear benignity despite the low perfusion fraction (If red), the same is valid for IADC. The HCC shows area-wide diffusion coefficient below cutoff (red ID), and mainly perfusion fraction below cutoff with heterogeneous distribution (If scattered red) and thus also IDf showing clear malignancy, IADC shows less red voxels compared to IDf (41% versus 69%) showing benignity, the visual assessment was “probably” benign. The CCC appears on all maps mainly red showing clear malignancy on IDf and IADC maps. The bilioma looks identical to the haemangiomas. The CRC reveals mainly red voxels within the selected region of interest, which excluded hypointense region on b-800 image (necrosis). CCC Cholangiocellular carcinoma, CRC Metastasis from colorectal carcinoma, FNH Focal nodular hyperplasia, HCC Hepatocellular carcinoma