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Anisotropy of the backscatter coefficient of formalin-fixed ovine myocardium.

Yang M, Krueger TM, Holland MR, Miller JG

Department of Physics, Washington University, St. Louis, Missouri 63130, USA.

The objective of this study was to measure the backscatter coefficient of formalin-fixed myocardial tissue as a function of angle of insonification relative to the myocardial fiber direction. Backscatter measurements were performed on eight cylindrical formalin-fixed lamb myocardial specimens and compensated for attenuation and diffraction effects to determine the backscatter coefficient. The backscatter coefficient at 5 MHz was found to be maximum for insonification perpendicular to the predominant myofiber orientation and minimum for parallel insonification, with values of (17+/-14) and (1.2+/-0.7) x 10(-4) cm(-1) sr(-1) (mean+/-standard deviation), respectively.

Published 6 July 2007 in J Acoust Soc Am, 122(1): 581-6.
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