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. Author manuscript; available in PMC: 2012 Jun 27.

Published in final edited form as: Ultrason Imaging. 2011 Oct;33(4):251–263. doi: 10.1177/016173461103300404

FIG.5 — Images from simulations depicting ratios of integrated echo signal power spectra from a sample to that from corresponding locations in a reference phantom. The sample and reference phantom have identical attenuation and backscatter coefficients, but c_sam = 1500m/s and c_ref = 1540m/s. The ratio values are expressed in dB. (a) Case I with transmit focus at 2cm (b) Case IV with transmit focus at 2cm (c) Case I with transmit focus at 4cm (d) Case IV with transmit focus at 4cm (e) Case I with transmit focus at 7cm (f) Case IV with transmit focus at 7cm.

FIG.5 — Images from simulations depicting ratios of integrated echo signal power spectra from a sample to that from corresponding locations in a reference phantom. The sample and reference phantom have identical attenuation and backscatter coefficients, but c_sam = 1500m/s and c_ref = 1540m/s. The ratio values are expressed in dB. (a) Case I with transmit focus at 2cm (b) Case IV with transmit focus at 2cm (c) Case I with transmit focus at 4cm (d) Case IV with transmit focus at 4cm (e) Case I with transmit focus at 7cm (f) Case IV with transmit focus at 7cm.