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Idea for omni-tomographic reconstruction in a unified framework. (a) an MR image phantom, (b) a CT image phantom corresponding to (a), where six implanted calcified regions are embedded, (c) a traditional CT reconstruction using the filtered backprojection method from 17 projections, and (d) dual-dictionary-learning-based CT reconstruction from the same 17 projections but aided by MRI data synthesized from (a) with 4-fold under-sampling [126].
