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Compression and relaxation tests on porcine brain, gelatin, CH and MCH. The overlapping curves in the compression step (a) demonstrate very similar elastic properties for all phantom materials to porcine brain; however, gelatin exhibits a different relaxation behavior, characterized by a very small decay in the relaxation plot (b). For this reason, porcine brain tissue, CH and MCH are considered viscoelastic materials, while gelatin is considered nearly elastic.
