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. Author manuscript; available in PMC: 2009 May 1.
Published in final edited form as: IEEE Trans Med Imaging. 2009 Feb;28(2):297–310. doi: 10.1109/TMI.2008.2004670

Fig. 3.

Fig. 3

Comparison of computing time (seconds) against iteration number between the theoretical solution (20) (solid line) and the approximated solution (21) (crosses), where β =0.5 was used