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Samples of 2 wt % alginate with different fat addition and cross-linking degrees (10 and 30 wt % fat, 0.25 and 0.75 wt % CaCO3) cast in the shape of letters T and F, embedded in a matrix variation (2 wt % alginate/0.25 wt % CaCO3/10 wt % fat). The CT and US images of the matrix contain the letters T and F. The window level and window width of the CT image are set at 40 and 350, respectively.
