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. Author manuscript; available in PMC: 2011 Aug 10.
Published in final edited form as: IEEE Trans Ultrason Ferroelectr Freq Control. 2010 Dec;57(12):2828–2832. doi: 10.1109/TUFFC.2010.1756

Fig. 2.

Fig. 2

Estimated ESD from simulated phantom for randomly spaced Gaussian scatterers in terms of (a) percent error of estimation using 5 spatial pulse lengths (SPL) axial ROI size, (b) absolute standard deviation using 5 SPL axial ROI size, (c) percent error of estimation using 10 SPL axial ROI size, and (d) absolute standard deviation using 10 SPL axial ROI size. Circle, asterisk, and square denote results from non-Welch method with rectangular window, conventional Welch method, and the new method, respectively. The horizontal axis is shown in terms of beamwidths (BW).