Figure 7

(a) the FDK reference in three planes of the same large-size breast shown in Fig. 5. (b–d) the AFN assisted image reconstructions at different undersampling rates in the coronal (b), sagittal (c), and axial (d) planes, respectively. The undersampling rates in percentage are reported in (c) for each combination of detector offset (vertical) and angular coverage (horizontal). AFN reconstructions with a 7.5 cm detector offset (37.5% truncation of a 40 cm detector) yield prominent artifacts in the coronal and axial planes even for the 270° angular coverage. AFN reconstructions with a 5 cm detector offset (25% detector truncation) yield not fully reconstructed breast skin structures near the chest wall, which are less pronounced as the view angle increases. Lastly, AFN reconstructions with a 2.5 cm detector offset (12.5% detector truncation) yield no visible artifacts even for the minimum view angle 204°. The display window is [0.15, 0.35] cm⁻¹.