| 摘要 |
An ultrasonic imaging system comprises a first array of transducer elements 10 adapted to be coupled to an object to be examined, which elements receive ultrasonic echo signals indicative of acoustic reflecting surfaces in the object. The received echo signals are converted by the first array of elements into electrical signals which are stored at 24 and retrieved so as to provide time reversal (time inversion) and thereafter used to energize a second array of transducer elements 27 coupled to a reconstruction medium 30. The ultrasonic signals transmitted by the second array, responsive to the time-reversed electrical signals, produce in the reconstruction medium a reconstructed acoustic image of the acoustic reflecting surfaces in the object. A visual image of the reconstructed acoustic image is obtained by acousto-optical means 32, such as a Schlieren device, and displayed at 36. <IMAGE> |
