Karen R. Marutyan

Measurements of the anisotropy of ultrasonic velocity in freshly excised and formalin-fixed myocardial tissue

Baldwin, Steven L., Yang, Min, Marutyan, Karen R., Wallace, Kirk D., Holland, Mark R., Miller, James G.

The objective of this study was to quantify the anisotropy of ultrasonic velocity in freshly excised myocardial tissue and to examine the effects of formalin-fixation. Through-transmission...

Negative dispersion in bone: The role of interference in measurements of the apparent phase velocity of two temporally overlapping signals

Bauer, Adam Q., Marutyan, Karen R., Holland, Mark R., Miller, James G.

In this study the attenuation coefficient and dispersion (frequency dependence of phase velocity) are measured using a phase sensitive (piezoelectric) receiver in a phantom in which two temporally...

Interference between wave modes may contribute to the apparent negative dispersion observed in cancellous bone

Anderson, Christian C., Marutyan, Karen R., Holland, Mark R., Wear, Keith A., Miller, James G.

Previous work has shown that ultrasonic waves propagating through cancellous bone often exhibit a linear-with-frequency attenuation coefficient, but a decrease in phase velocity with frequency...