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英文誌(2004-)

Journal of Medical Ultrasonics

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cover

1985 - Vol.12

Vol.12 No.06

Original Article(原著)

(0471 - 0477)

不規則媒質の後方散乱係数のin vitro測定

In Vitro Measurement of a Backscattering Coefficient for a Random Medium

秌田 雅彦, 上田 光宏

Masahiko AKITA, Mitsuhiro UEDA

東京工業大学精密工学研究所

Research Laboratory of Precision Machinery and Electronics, Tokyo Institute of Technology

キーワード : Random medium, Backscattering coefficient, Tissue characterization, Nonlinear acoustic effect, Gated sine wave

 It have known that the intensity of echoes scattered by a random medium can be evaluated quantitatively in term of a backscattering coefficient. Since ultrasonic pulse systems used in medical diagnostic and nondestructive testing display the scattering intensity of medium, it is important in Tissue Characterization to establish the method for measuring the backscattering coefficient.
 In this paper it is shown about the method for measuring the backscattering coefficient of a stratified homogeneous medium in a bath (it is called in vitro measurement of the backscattering coefficient). We have suggested the method for correcting the influence of beam pattern on for measuring the backscattering coefficient and showed the method for measuring the backscattering coefficient using a broad band pulse, but it was a point at issue to have much influence of nonlinear acoustic effect in the higher frequency range of the broad band. In this paper in vitro measurement of the backscattering coefficient has been accomplished by combining the method to correct the influence of beam pattern with a gated sine wave.
 Though this method are not suitable to in vivo measurement, it will be important on the development of ultrasonic signal processing technology since it can measure the standard value of the backscattering coefficient.