| 摘要 |
PURPOSE:To reduce the loss of sensitivity caused by acoustic matching with an organism and multipath reflection on the organism by forming a concave lens of materials whose acoustic impedance is close to that of the organism and whose acoustic velocity is faster than that of the organism. CONSTITUTION:An ultrasonic probe is equipped with plural oscillators 3 on the top face of an acoustic absorber 2, an acoustic match layer 4 on the top face of the oscillators 3, and an acoustic lens 1 on the top face of this acoustic match layer 4. The acoustic lens 1 is the concave lens formed of the materials whose acoustic impedance is close to that of the organism and whose acoustic velocity is faster than that of the organism. Thus, it is possible to obtain the ultrasonic probe in which the acoustic matching with the organism is satisfactory, the multipath reflection on the organism is small, and the attenuation of a high-frequency ultrasonic wave is extremely small. |
