abstract |
PROBLEM TO BE SOLVED: To provide a method for evaluating ultrasonic characteristics of a medium. In this method, an experimental reflection matrix Rui (t) defined between a step of generating a series of incident ultrasonic waves and an emission basis (i) as an input and a reception basis (u) as an output. And an input virtual transducer (TVin) that is calculated based on focusing as an input to the experimental reflection matrix, and an output virtual transducer (TVout) that is calculated based on focusing as an output from the experimental reflection matrix. The output virtual transducer (TVout) response is added to the time point of the input virtual transducer (TVin) response, with the step of determining the media focused reflection matrix RFoc (rin, route, δt) between and. It is obtained when the delay δt is shifted. [Selection diagram] FIG. 4 |