Numerical Calculation and Measurement of Nonlinear Acoustic Fields in Ultrasound Diagnosis

概要

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In order to develop a tool for designing on the ultrasonic probe and its peripheral devices for tissue-harmonic-imaging systems, a study is carried out to compare the calculation and observation results of nonlinear acoustic fields for a diagnostic ultrasound system. The pulsed ultrasound with a center frequency of 2.5MHz is emanated from a weakly focusing sector probe with a 6.5mm aperture radius and a 50mm focal length into an agar phantom with an attenuation coefficient of about 0.6dB/cm/MHz or 1.2dB/cm/MHz. The nonlinear acoustic field is measured using a needle-type hydrophone. The calculation is based on the Khokhlov-Zabolotskaya-Kuznetsov(KZK) equation which is modified so that the frequency dependence of the attenuation coefficient is the same as that in biological tissue. This equation is numerically solved with the implicit backward method employing the iterative method. The measured and calculated amplitude spectra show good agreement with each other. [DOI: 10.1143/JJAP.41.3549]
社団法人応用物理学会の論文
2002-05-30