| 摘要 |
The composite wave obtained by combining a fundamental wave having the center frequency f1 and a fundamental wave having the center frequency f2 is transmitted at least twice for each scanning line while performing phase modulation, and received an echo signal corresponding to each transmission for each scanning line. An echo signal in which harmonic components are canceled out, is extracted for each scanning line, by performing subtraction processing between echo signals which are obtained in this manner and respectively correspond to at least two transmissions. A signal strength difference (or a signal ratio if logarithmic compression is not performed) at each position on the scanned cross-section is calculated by using the f1 frequency component and f2 frequency component contained in the extracted echo signal. An attenuation image representing the signal strength difference at each position on the scanned cross-section is generated by using the calculated signal strength difference.
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