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. Author manuscript; available in PMC: 2010 Apr 13.
Published in final edited form as: IEEE Trans Ultrason Ferroelectr Freq Control. 2010;57(2):340–352. doi: 10.1109/TUFFC.2010.1414

Fig. 11.

Fig. 11

The depth dependence of the size estimation variance using the Welch method vs. (a) number of independent A-lines to be averaged when an 11-wavelength window is used and (b) window length when 9 independent A-lines are averaged. Data from the VFX9-4 transducer were used for these curves. The theoretical values are calculated according to equation (5) assuming a rectangular window and equation (6).