There is a wide range of algorithms for binary and non-binary (called multivalued) discrete tomography. For example, the DART, Discrete Algebraic Reconstruction Technique (4) is capable of producing highly accurate reconstructions by thresholding a continuous reconstruction and then adjusting the object boundaries. Also, there are reconstruction algorithms based on minimizing an energy function by deterministic (13; 15; 16; 18) or randomized (1; 2; 8; 14) optimization strategies.