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. Author manuscript; available in PMC: 2013 Sep 9.
Published in final edited form as: Proc SPIE Int Soc Opt Eng. 2012 Feb 23;8313:83130Q. doi: 10.1117/12.911351

Figure 2.

Figure 2

Sample image of the step wedge and the ROI’s used to calculate the average gray value. Example of a plot of aluminum thickness versus gray value and logarithmic fit; such curves were derived for every exposure setting.