Figure 4

Image reconstructions of a median-size breast (14.5 cm chest wall diameter). Incomplete projection data were used in the four competing methods (columns 1–4) including FDK with Parker weight, FDK with offset-detector weight (denoted as FDK-M), FDK with both weights, and FDK-M with AFN inpainted data. Complete projection data were reconstructed using FDK to obtain the reference (last column). FDK with weighting functions can account for either the short-scan or the offset-detector geometry, leading to residual artifacts and/or inhomogeneous attenuation coefficients as expected. The red arrow indicates the elongated structures due to short scan. FDK with two weights exacerbates the artifacts or inhomogeneities. Lastly, FDK-M with AFN inpainting delivers visually similar images as the reference. The display window is [0.15, 0.35] cm⁻¹.