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. Author manuscript; available in PMC: 2014 Jan 3.
Published in final edited form as: Ultrason Imaging. 2013 Jul;35(3):10.1177/0161734613495524. doi: 10.1177/0161734613495524

Fig. 5.

Fig. 5

Laboratory and “reference phantom method” estimates of αsample(f) [dB/cm] vs. frequency for (a) the largest window size (20 pulse-echo correlation lengths (PECLs) and 22 uncorrelated acoustic scanlines (SL)), (b) 10 PECLs and 22 uncorrelated SL, and (c) 10 PECLs and 2 uncorrelated SL. Subfigures in (a)-(c) are for different spectral estimators: (i) Short-time Fourier transform with rectangular taper (REC) and (ii) Thomson's multitaper method (MTM). Estimates were averaged across 20 RF frames. In all cases, the α-estimation length was 33 PECLs.