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One reconstructed slice of a patient from low-flux projection data: (a) FBP reconstruction; (b) FBP reconstruction followed by NLM filtering (SW=172, PW=52, h=0.012); (c) PWLS-NLM reconstruction (SW=172, PW=52, h=0.008); (d) PWLS-adaptiveNLM reconstruction (SW=172, PW=52, s=1×10−3, t=4×10−6). All images are displayed with the same window. (Figure reprinted from the work of Zhang et al 68)
