Ultrasonic Attenuation in Tissues

Ultrasonic absorption and attenuation in mammalian tissues.

-The ultrasonic absorption was determined, by the transient thermoelectric method, for brain, heart, kidney, liver, tendon, and testis from cat, mouse, pig and beef. Comparison of these absorption {a) values with published values of attenuation (A) shows: (1) that the a and A coefficients have nearly the same frequency dependencies in the range 0.5-7 MHz, (2) that the magnitudes of a and A diff...

Ultrasonic Attenuation in Solid Helium

A great deal of information about the motion of dislocations in solid helium has been obtained from ultrasonic and interna1 friction measurements. A brief review is given and representative data for 3 ~ e are presented, showing dislocation resonance and damping as well as pinning effects.

Attenuation of ultrasonic waves in rolled metals.

Scattering of ultrasonic waves in polycrystals with texture is studied in this article. The attenuations of the three wave modes are determined as a function of dimensionless frequency and propagation direction, respectively, for given orientation distribution coefficients (ODCs). The calculation is done in the case of a statistically orthorhombic sample made up of cubic crystallites. The wave ...

Ultrasonic Attenuation in Polycrystalline 5n Aluminium

Ultrasonic Attenuation Measurement Using Backsgattering Technique

Ultrasonic backscattering measurements by means of spatial averaging technique were carried out in steel to determine the ultrasonic attenuation coefficient. The attenuation coefficients were evaluated from the exponential decay of the backscattering signal. The results were compared with those obtained by evaluating the amplitude decay of the main pulse. Good agreement is observed provided the...