The reconstructed FAI-maps are compared for competing processing approaches, namely: the PM approach, our 2D multi-slice spatial regularization approach, the current approach for simulated FAI-map (left panel) at different SNR (10000, 500, 200, 100). To better assess reconstruction performances, normalized reconstruction error of FAI-map w.r.t. simulated FAI-map are displayed (right panel). At high SNR of 10000, FAI-map reconstructed using either of methods were very close to the truth. At lower SNR (≤ 200), proposed approach is the best performer among all competing approaches.