Skip to main content
. 2015 Jul 28;42(8):4872–4887. doi: 10.1118/1.4926846

FIG. 7.

FIG. 7.

MSE (18) vs postreconstruction Gaussian filter radius σ for GPF-EM and vs penalty-weight λ for TV-OSL and TV-PAPA, and λ1 for HOTV-PAPA reconstructions. We arrived at the same penalty-weight value for TV-PAPA, HOTV-PAPA, and TV-OSL (λ = λ1 = 0.018). Second penalty-weight, λ2, for HOTV-PAPA reconstructions was set const (λ2 = 0.007) for the whole range of λ1. The arrow pointing at the lower axis indicates the value of penalty-weight that was selected for reconstructions in the present comparative studies. The nonoptimal Gaussian blurring kernel radius σ = 2.9 mm (upper arrow) was selected to approximately match the local spatial resolution between GPF-EM and HOTV-PAPA.