| 摘要 |
An ultrasonic transmitting apparatus for examination of a subject in a field comprising, a CRT transmitter having a transducer excited at relatively low energy level and at a frequency which is half of the resonating frequency of the transmitting transducer to enhance receiver sensitivity. The transmitting transducer is excited in a pattern to generate corresponding successive acoustic waves to scan the subject in "flying spot" type fashion, and a receiver including a non-scan receiving transducer for electrically converting the subject reflected signals and providing a visual display.
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