Ultrasonic Absorption in Biological Media

Ultrasonic Absorption Microscope

This paper constitutes a progress rersort on the develol•ment of an ultrasonic instrument for detecting microstructure. The principle of operation of the device (designated by the term "ultrasonic microscope") is as follows: The specimen is imbedded in a liquid, which closely matches it in acoustic impedance, and is irradiated with sho•t pulses of highdreqnency hound. Some of the ultrasonic ene...

Airborne Ultrasonic Transducers for Ultrasonic Transmission Tomography in Gaseous Media

Ultrasonic transmission tomography is one of the measurement methods used for imaging of internal structure of various media. The method can be used in gaseous media, e.g. to identify the shape, size and location of objects, to determine the spatial distribution of temperature in a studied area (if here is a heterogeneous field of that quantity) and to determine concentration of components of s...

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...

Two coupling media method for ultrasonic velocity measurement in biological tissues

Statistically stable ultrasonic imaging in random media.

Analysis of array data from acoustic scattering in a random medium with a small number of isolated targets is performed in order to image and, thereby, localize the spatial position of each target. Because the host medium has random fluctuations in wave speed, the background medium is itself a source of scattered energy. It is assumed, however, that the targets are sufficiently larger and/or mo...