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Detectability index computed as a function of smoothing parameters for FBP [(a) and (c)] and PL [(b) and (d)] reconstructions for the midfrequency task [(a) and (b)] and the all-frequency task [(c) and (d)] defined in Sec. II D. The optimal smoothing required for PL is dependent on the location within the reconstruction, while the difference is considerably smaller in FBP.
