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Absorption and attenuation in soft tissues. II. Experimental results
1Dept. of Electr. Eng., Rochester Univ., NY.
Summary
Ultrasonic loss mechanisms in tissues were studied using advanced automation and calibration. Results show absorption accounts for 90-100% of total attenuation in most biological tissues.
Area of Science:
- Biomedical Engineering
- Acoustics
- Materials Science
Background:
- Understanding ultrasonic loss mechanisms is crucial for medical diagnostic imaging.
- Previous methods limited frequency range and sample volume for absorption measurements.
Purpose of the Study:
- To quantify the relative contributions of ultrasonic absorption and scattering to total attenuation in biological tissues.
- To develop and apply novel experimental techniques for accurate ultrasonic measurements.
Main Methods:
- Independent measurements of total attenuation and local absorption at 1-13 MHz.
- Utilized automation for averaging and curve fitting to enhance accuracy.
- Developed new calibration methods for focused beams in pulse-decay absorption measurements.
Main Results:
- Absorption constitutes 90-100% of total attenuation in agar-gelatin phantoms, calf liver, and pig liver.
- Studies on bovine brain and muscle suggest absorption is also the major contributor, though less definitively.
- Demonstrated feasibility of wider frequency range and smaller sample volumes for absorption measurements.
Conclusions:
- Ultrasonic absorption is the dominant loss mechanism in most tested biological tissues.
- The developed methods allow for more precise comparisons of attenuation and absorption across various biological media.
- Scattering appears to play a minor role in total ultrasonic attenuation for these tissues.
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