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Volumn 87, Issue 1, 1990, Pages 179-192

Describing small-scale structure in random media using pulse-echo ultrasound

Author keywords

[No Author keywords available]

Indexed keywords

ARTICLE; ECHOGRAPHY; FREQUENCY MODULATION; METHODOLOGY; NONHUMAN; ULTRASOUND; WAVEFORM;

EID: 0025343519     PISSN: 00014966     EISSN: NA     Source Type: Journal    
DOI: 10.1121/1.399283     Document Type: Article
Times cited : (415)

References (25)
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    • Poisson's ratio for fat was calculated from the equation 1 — x2/2(x-1), where x is the ratio of longitudinal and shear speeds of sound. We used a shear speed for fat of 55 m/s, which is an average taken from the work of Frizzell and Carstensen
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    • Poisson's ratio for fat was calculated from the equation 1 — x2/2(x-1), where x is the ratio of longitudinal and shear speeds of sound. We used a shear speed for fat of 55 m/s, which is an average taken from the work of Frizzell and Carstensen [J. Acoust. Soc. Am. 60, 1409–1411 (1976)]. They reported shear speeds of sound for various soft tissues between 9 m/s and 100 m/s. Poisson's ratio for a fluidlike medium that does not support shear waves is v = 0.5
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    • S. Cusack and A. Miller, “Determination of the elastic constants of collagen by Brillouin light scattering,” J. Mol. Biol. 135, 39–51 (1979). The elastic parameters for collagen reported by Cusack and Miller were measured using mouse-tail tendon and an inelastic light scattering technique. Their value for Young's modulus (5.1 GN/m2) was comparable to that of Harley et al. [Nature 267, 285–287 (1977)] using the same technique (9.0 GN/m2) but was significantly greater than the measurements reported by Burton [Physiology and Biophysics of the Circulation (Year Book Medical, Chicago, 1972), 2nd ed., pp. 65–69] using a mechanical method (0.1 GN/m2). The longitudinal speed of sound measured across the fibers (1890 m/s) was comparable to the measurements of Goss and O'Brien [ J. Acoust. Soc. Am. 65, 507–511 (1979)] using an acoustic microscope (1733 m/s). Using the Cusack and Miller estimate of shear modulus (G = 3.3 GN/m2) and Poisson's ratio (v = 0.42), the compressibility of collagen was calculated using k = 3(1— 2v)/2G(1 + v) and found equal to 5.12 X10-11m2/N. This result is roughly one-third the value for compressibility that is obtained using the longitudinal sound speed along the fibers (2640 m/s) and density (1.12 g/cm3): K= (l/ρC2)[1+2(1 -2v)/(l + v)] = 15.7X10-1m2/N. Still, the similarities between the scattering properties of plastics and collagen remained for the range of properties given above
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* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.