| 摘要 |
<p>An ultrasonic imaging method and apparatus wherein the ultrasonic energy transmitted to a subject under examination is generated by a plurality of electroacoustic transducers, which are actuated for transmission with predetermined delays according to a predetermined focusing rule; the ultrasonic energy reflected by the subject under examination is received by an array of electroacoustic transducers. The latter are actuated or the received signals are read with predetermined delays according to a received signal focusing rule. The focused received signals are turned into image data for ultrasonic image display. The transmitting transducers are actuated with such delays as to generate a homogeneous acoustic field over all or part of the region of the subject under examination, which may be covered by the geometry of the whole array of transducers.</p> |
