| 摘要 |
PROBLEM TO BE SOLVED: To simplify the constitution of a gain adjusting means, and reduce manufacturing cost by providing a tap selecting means to select ultrasonic wave received signals inputted to delay taps, and arranging the gain adjusting means between the delay taps and the tap selecting means. SOLUTION: In an ultrasonic diagnostic device 1, a gain adjusting means 9 is arranged between respective delay taps 81- T of a large delay line 8 and a cross point switch 7. The gain adjusting means 9 is composed of gain changing circuits 101- T interposed between the respective delay taps 81- T and the cross point switch 7 and a gain control part 11 to control this gain. Therefore, the constitution of the gain adjusting means 9 is simplified. That is, though the channel number must be at least in the same number as ultrasonic probes to constitute a diameter, since delay time of the delay taps 81- T becomes the same time in left and right diameter positions becoming an equal distance when the diameter is looked from a central position, the number of delay taps 81- T can be reduced more than the diameter by that extent. |
