| 摘要 |
An ultrasonic image producing instrument of the impulse echo type is used for making visible sections of an object being examined, particularly inner organs in the body of a patient. The instrument has an ultrasonic emitting and receiving system, the emitter of which sends an ultrasonic ray into the object being examined and the receiver of which receives echo impulses reflected from various limiting surfaces of the object. The instrument also has drives for shifting the system relatively to the object being examined, namely, by shifting the ultrasonic ray line by line selectively in one plane or in a plane perpendicular thereto while the ray direction always remains the same. The instrument also has an oscillograph tube having an electron ray which is deviated by a vertical sweep generator synchronized with the ultrasonic emitter in a vertical direction with a speed proportional to the duration of the emitted impulse in the object being examined and deviated by a horizontal sweep generator capable of being synchronized with the drives in the horizontal direction with a speed proportional to the shifting speed of the ultrasonic ray in the respective plane, the deviation taking place over the image screen of the tube, which lights and measures the echo impulses transmitted by the receiver to the Wehnelt cylinder of the tube.
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