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Images were reconstructed with 30% ASIR. Images are (A) NI = 15, objective image noise 10.95; (B) NI = 20, objective image noise 18.28, (C) NI = 30, objective image noise 28.5, and (D) NI = 40, objective image noise 41.52. The visibility of the small structure (arrow) in D was around average.
