| 摘要 |
According to an aspect of the present invention, since an attenuation factor of ultrasound inside a subject is derived from changes in the phase of an ultrasound echo in a depth direction of the subject, the attenuation factor can be determined simply and conveniently. Accordingly, a plurality of band-pass filters that have different center frequencies, and a signal processing circuit that performs individual detection and logarithmic compression for each band and the like are not required.
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