Rivera CMA, Reiszel PF, Pereira WCA, Machado JC

Language: Spanish
References: 12
Page: 5-10
PDF size: 105.22 Kb.

ABSTRACT

Ultrasound (US) phantoms are generally used to mimic the acoustic properties of human tissue and thus provide a better understanding of the interaction of sound with tissue. Wave propagation velocity (WPV) is considered constant in commercial US phantoms, around 1,540 m/s. In the human body, the WPV varies according to the type of tissue, between 1,450 m/s and 1,650 m/s. US phantoms in which WPV varies will provide additional information on the US behavior besides the one provided by the conventional US phantoms. In this work, four procedures, to construct US phantoms with WPV profiles, are presented. The first two methods use polymer and epoxy resin as base materials. On the second method, tungsten powder is added to the epoxy resin in order to provide variation of the mixture WPV. On the third and fourth methods, respectively, distilled water and ethilic alcohol are used as the basic materials, in which ethilenoglycol is added to increase the WPV. Phantoms ecogenicity is acquired by adding silica particles (0.8 mm diameter) to the mixture during the cure process. The method with the best result is presented and its results discussed.

REFERENCES

1. Robinson DY, Ophir J, Wilson LS, Chen DF. Pulse-echo ultrasound speed measurements: progress and prospects, Ultrasound Med Biol, 1991; 17(6): 633-646.

2. Bude REL, Adler RS. An easily made, low-cost, tissue-like ultrasound phantom material. J Clin Ultrasound; 1995; 23: 271-273.

3. Rownd JJ, Madsen YL, Zagzebski JA, Frank GR, Dong F. Phantoms and automated systems for testing the resolution of ultrasound scanners. Ultrasound Med. Biol 1997; 23(2): 245-260.

4. Sommer FG, Filly RA, Edmonds PD, Reyes Z, Comas MH. A phantom for imaging biological fluids by ultrasound and CT scanning. Ultrasound Med Biol 1980; 6: 135-140.

5. Zagzebski JA, Madsen YL. Ultrasonics phantoms IEEE Trans. Nuclear Science 1980; vol NS-27(3): 1176-1180.

6. Sayers CM, Tait CY. Ultrasonic properties of transducer backings. Ultrasonics 1984: 57-60.

7. Lees S, Davidson CL. Ultrasonic measurement of some mineral filled plastics. IEEE Trans Sonics Ultrason 1977: 222-225.

8. Rokhlin S, Golan S, Gefen Y. Acoustic properties of tungsten-tin composites. J Acoust Soc Am 1981; 69(5): 1505-1506.

9. Rivera Cardona M, Pereira WCA, Machado JC. Estimativa del perfil de velocidad acústica de um Meio Espalhador: resultados simulados. Anais del IV Forum Nacional de Ciência y Tecnologia en Saude 1998: 383-384.

10. Selfridge AR. Approximate material properties in isotropic materials. IEEE Trans. Sonics Ultrason 1985; su-32: 381-394.

11. Birks AS, Green RY Jr, McIntire P. Americam society for nondestructive testing handbook, 2nd Edition, 1991; vol 7.

12. Pereira FR. Medición de velocidad de propagación de la onda ultra-sônica a partir del perfil de atraso de sinais retroespalhados. Tese de Doutorado, Prog Eng Biomédica /COPPE/UFRJ, 1999.