| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an ultrasonic diagnostic apparatus capable of forming an ultrasonic image of high image quality by efficiently performing the sending-out of ultrasonic waves while using an ultrasonic probe having a simple structure. <P>SOLUTION: The organic piezoelectric body 34a of an organic piezoelectric element 34 has thickness D satisfying a λ/4 resonance condition to the wavelength λ of the ultrasonic waves transmitted from an inorganic piezoelectric element 32. The amplifier 52 for the organic piezoelectric element 34 in a receiving circuit 5 is connected to a signal line electrode layer 34b through a transmission cable 54 having electrostatic capacity within a range of 0.1-5 times with respect to the electrostatic capacity of the organic piezoelectric element 34 and a plurality of the organic piezoelectric elements 34 act as the second acoustic matching layer continued to an acoustic matching layer 33 at the time of transmission and utilized as a non-resonance type receiving device at the time of reception. A receiving signal is transmitted to the amplifier 52 for the organic piezoelectric element from a signal line electrode layer 34b through a transmission cable 54 before subjected to A/D conversion by the A/D converter 53 for the organic piezoelectric element. <P>COPYRIGHT: (C)2013,JPO&INPIT |
