| Autor: |
Yang M; Department of Physics, Washington University, St. Louis, Missouri 63130, USA., Krueger TM, Holland MR, Miller JG |
| Jazyk: |
angličtina |
| Zdroj: |
The Journal of the Acoustical Society of America [J Acoust Soc Am] 2007 Jul; Vol. 122 (1), pp. 581-6. |
| DOI: |
10.1121/1.2737747 |
| Abstrakt: |
The objective of this study was to measure the backscatter coefficient of formalin-fixed myocardial tissue as a function of angle of insonification relative to the myocardial fiber direction. Backscatter measurements were performed on eight cylindrical formalin-fixed lamb myocardial specimens and compensated for attenuation and diffraction effects to determine the backscatter coefficient. The backscatter coefficient at 5 MHz was found to be maximum for insonification perpendicular to the predominant myofiber orientation and minimum for parallel insonification, with values of (17+/-14) and (1.2+/-0.7) x 10(-4) cm(-1) sr(-1) (mean+/-standard deviation), respectively. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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