We propose a new multi-compartment model for the tissue signal in MRI and apply this to images of liver and placenta. Motivated by different flow characteristics in these organs, a three compartment model comprising fast and slowly circulating fluid pools and a tissue pool is fitted to overlapping multi-echo T2 relaxometry and an intra-voxel incoherent motion diffusion acquisition with low b-values. We compare and contrast parametric maps for regions of interest in liver and placenta.
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