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Experimental setup. (A) Ultrasound imaging setup showing the custom made PEG hydrogel holder fixed above the transducer. (B) Custom made imaging platform consisting of a water-filled acrylamide mold containing PEG hydrogel samples. (C) Sample output image: for each set of samples, images were gathered for three different sagittal cross sections, and three regions of interest were manually chosen for each gel in the image.
