| 摘要 |
<p>PROBLEM TO BE SOLVED: To achieve a technique for determining credibility in specifying the position of a layer structure of a vascular wall on the basis of a reflected wave signal of an ultrasonic wave.SOLUTION: A first interface H1n of a media-adventitia interface and a second interface H2n of a lumen-intima interface are specified based on reflected waveform data 40n in an n-th frame. A first interface H1m being a media-adventitia interface and second interfaces H2ma and H2mb being a lumen-intima interface are specified based on reflected waveform data 40m in an m-th frame. A first interface displacement amount dH1 and second interface displacement amounts dH2a and dH2b between the n-th and m-th frames are determined. A reference displacement amount dHp is calculated from the same reflected waveform data by phase difference tracking as the displacement amount of a vascular wall. Moreover, evaluation values (EP1-EP5) for evaluating interface specification credibility are calculated from the first interface displacement amount dH1, second interface displacement amounts dH2a and dH2b, and the reference displacement amount dHp.</p> |
