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. Author manuscript; available in PMC: 2010 Sep 7.
Published in final edited form as: Med Phys. 2006 Jun;33(6):1643–1653. doi: 10.1118/1.2194427

Fig. 2.

Fig. 2

Schematic of model-based algorithm for measuring tube diameters; (A) the selected tube section has a pixel intensity profile; (B) circles with diameters ranging from 70% to 130% of initial diameter guess are considered; (C) simulated pixel intensity profiles are calculated for each circle size; (D) a least-squares fit is performed between actual pixel intensity profiles and simulated pixel intensity profiles of different diameters; the diameter of the simulated pixel intensity profile with the minimum least-squares error when fit to the actual pixel intensity profile is the measured diameter of the selected tube section.