Use of a Total Variation Minimization Iterative Reconstruction Algorithm to Evaluate Reduced Projections during Digital Breast Tomosynthesis

Figure 10

Case 2. Comparisons between images obtained at different projection numbers (normal: 15, half: seven) using each tomosynthesis reconstruction algorithm in the in-focus plane. The X-ray source was moved horizontally along the image. Zoomed images depict the lesion areas. For each corresponding set, IR (MLEM, SART, and ASD-POCS) images are displayed at the same window width and level, whereas the FBP images have a larger window widths because the backgrounds are less flattened and the gray levels in larger areas would be out of scale in narrower windows.