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MRI experimental details. (a) Plastic tube filled with saline gel phantom, test sample, and 3D-printed polylactic acid (PLA) holder. Holder glued to the blue screw cap and the sample to the PLA holder. (b) Coil insertion into the MRI bore used for all MRI experiments. The sample tube was first centered in the coil. Note the absence of air bubbles in the phantom.
