Figure 1
From: Homotopic non-local regularized reconstruction from sparse positron emission tomography measurements
Reconstructed tomograms from simulated phantom using three different reconstruction methods based on 30% sampling. We can see very clearly that the FBP method leads to considerable artifacts in the reconstructed tomogram, with significant streaking artifacts over both the background and the phantom details. Both TVR and HNLR methods were able to significantly suppress these artifacts caused due to sampling at sub-Nyquist sampling fractions. It can also be observed that the details (e.g., dark circles) in the tomogram reconstructed using HNLR appear sharper than that reconstructed using TVR.