The frequency dependence of ultrasonic velocity and the anisotropy of dispersion in both freshly excised and formalin-fixed myocardium

Ultrasound in Medicine & Biology
Karen R MarutyanJames G Miller

Abstract

The objectives of this study were to measure the frequency dependence of the ultrasonic velocity in myocardium and to quantify the frequency dependence of phase velocity as a function of the insonification angle relative to the predominant direction of the myofibers. Broadband phase spectroscopy data were acquired, spanning a frequency range of 3 to 8 MHz. Measurements were made on 36 tissue specimens cored from 12 freshly excised lamb hearts and were repeated after fixation with formalin. Measured phase velocities were found to be well characterized by a logarithmic fit. For freshly excised myocardium, the dispersion over the 3 to 8 MHz bandwidth was dependent on the direction of insonification, ranging from 1.2 m/s change for perpendicular insonification (across the myofibers) to 3.7 m/s for parallel insonification (along the myofibers). The effects of formalin-fixation resulted in a significant increase in dispersion for perpendicular insonification, but did not appreciably alter the dispersion for parallel insonification.

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Citations

Jul 7, 2007·The Journal of the Acoustical Society of America·Min YangJames G Miller
Apr 17, 2007·Ultrasound in Medicine & Biology·Yoav LevyHaim Azhari
Jul 20, 2010·IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control·Andrew DawsonGideon Gouws
Aug 28, 2007·IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control·Steven L BaldwinJames G Miller
Oct 30, 2016·Journal of Biomechanics·Richard L Marsh
Dec 2, 2006·The Journal of the Acoustical Society of America·Karen R MarutyanJames G Miller
Sep 14, 2012·Ultrasonic Imaging·Michelle L MilneMark R Holland

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