. 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

TABLE I.

Mean Squared Error for Three Different Methods^* Using Various ROI Sizes.

ROI size (axial × lateral)^†	Method I	Method II	Method III
5 SPL × 1 BW	11.07	4.98	2.58
5 SPL × 2 BW	5.64	2.16	0.78
10 SPL × 1 BW	14.24	6.26	0.59
10 SPL × 2 BW	6.81	1.92	0.38

Methods I, II, and III refer to non-Welch method with rectangular window, conventional Welch method, and the new method, respectively.

^†

SPL = spatial pulse length; BW = beamwidth.