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Fig 1. Simulation of parallel imaging at acceleration factor of R = 2 by using perfect/imperfect sensitivity profiles. Image of object (A) was acquired by 2-channel RF coils. Each accelerated raw image (B1 and B2) shows an aliasing pattern due to reduced FOV, which could be unfolded correctly if sensitivity profiles are perfectly obtained (C). With erroneous sensitivity profiles, unfolding artifacts would take place, showing an aliasing pattern spaced at FOV/R from the original object along the phase-encoding direction (D).
