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How to create low contrast phantom for reconstruction simulation.

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Young el 13 de Mayo de 2013
Can I use phantom(E,N) to create such a phantom? If so, please give me an example of E. And explain how the matrix E works. Thanks.
I've tried to increase the intensity of the whole background and lower the intensity of ellipses. It does give me a low contrast phantom, but I cannot reconstruct from its projection.

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