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The execution time and the computational speedup between the two versions of the Toeplitz reconstruction strategy on one Tesla M2070 GPU. In step 1, a reduction in execution time of 17.5 hours (63098.20 s to 55.64 s, about 1134x speedup) was obtained for the image size of 256x256x32 with 1574656 input samples per coil. Note that Step 3 takes the same amount of time across the two versions as they use the same conjugate gradient solver.
