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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. 4.

Fig. 4

Scatterer size estimation errors 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. Results are presented for data acquired with the VFX13-5 transducer and using different spectral estimation methods. (c) Scatterer size estimation errors at 1, 2, and 3cm depth using the Welch method vs. the number of independent A-lines averaged when an 11-wavelength window is used, and (d) size estimation errors at different depths vs. window length when 9 independent A-lines are averaged.