| 摘要 |
A method and apparatus for acoustical examination of a specimen, in which the specimen is insonified with low-duty-cycle, high-frequency acoustical pulses, acoustical energy reflected from or transmitted through the specimen impinging upon an image plane. A transducer scans the image plane at a velocity coordinated to the arrival in the image plane of energy from points, successively insonified, in an object plane intersecting the specimen. The transducer generates an electrical signal representative of acoustic properties of that portion of the specimen coincident with the object plane; the object plane can be displaced by varying the timing of initiation of the transducer scan and can be angularly displaced by adjusting the scanning speed.
|
