Iterative Inversion LFE Inversion 0 2 4 6 8 10 12 14 Shear Modulus (kPa) Iterative MRE DI MRE DMA 0 2 4 6 8 10 12 MR Magnitude Iterative Inversion LFE Inversion 0 2 4 6 8 10 Shear Modulus (kPa) Iterative MRE DI MRE DMA 0 2 4 6 8 10 12 MR Magnitude Iterative Inversion LFE Inversion 0 5 10 15 20 25 30 35 Shear Modulus (kPa) Iterative MRE DI MRE DMA MR Magnitude 0 2 4 6 8 10 12 Figure 2: A collection of 3 separate gelatin phantom experiments, at a range of signal to noise ratios. The leftmost image shows the MR magnitude image, which show the true geometry of the phantoms. DMA measurements of the phantom material are 3.3 ±0.8 kPa for the soft background (5% gelatin), and 8.8 ±0.9 kPa for the stiff inclusions (10% gelatin). The second image from the left is the iterative MRE stiffness estimate, the 3rd image is the LFE estimate, and the rightmost plot is a profile through the inclusion, where the location is indicated by a red line on the MR magnitude image. The DMA estimate is shown as a black line. 54
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