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. Author manuscript; available in PMC: 2015 Jul 15.
Published in final edited form as: IEEE Trans Med Imaging. 2012 May 16;31(10):1837–1848. doi: 10.1109/TMI.2012.2199763

Figure 4.

Figure 4

(a) Convergence plots for KCR using alternating applications of image updates using 60 subsets and registration updates using 4 (∇), 6 (○), and 10 (□), BFGS iterations. (b) Convergence plots for alternating updates of 10 BFGS iterations and ordered subsets based image updates using 1 (∇), 5 (○), 10 (□), 20 (◊), 40 (Δ), and 60 (☆) subsets, as well as an approach that uses a dynamic number of subsets (▷). Objective function differences are plotted after both the registration block (identifying symbol) and after the image update (◎).