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. Author manuscript; available in PMC: 2011 Jul 1.
Published in final edited form as: Ultrason Imaging. 2011 Apr;33(2):134–142. doi: 10.1177/016173461103300204

Fig. 1.

Fig. 1

Shear-wave speed as a function of graphite concentration (left), with the standard deviations representing the variability over nine different imaging locations. There is a linear correlation between these quantities (R2 = 0.99, p < .01) with a slope of 0.06 (m/s) / [% graphite]. Attenuation coefficient slope as a function of weight percent graphite (right) has a linear correlation as well (R2 = 0.99, p < 0.01) with a slope of 0.07 (dB/(cm MHz)) / [% graphite] with standard deviations over the replicate phantoms.