| 摘要 |
An ultrasonic scanner in which one or more ultrasonic transducers 32a traverse an arcuate path with respect to a reflector 54 which converges ultrasonic waves at a point a preselected distance in front of the reflector. In general, the ultrasonic waves are converged at a point outside the scanner and inside an object to be examined to produce a sector scan in the object having its center at the convergence point. In one embodiment the reflector only partially reflects the ultrasonic waves and an additional stationary transducer is provided which is positioned to produce ultrasonic waves which radiate through the reflector and coincide with one of the lines of the sector scan, thus permitting simultaneous M-mode or pulse Doppler echo information to be obtained in perfect registration with the sector scan lines. Attenuation and anti-reflection means are provided to suppress echo artifacts. <IMAGE> |
