| 摘要 |
<p>An ultrasonic wave tomographic imaging system incorporating ultrasonic wave transducer means (23) for radiating signals into an object and for receiving signals from the object via an ultrasonic wave lens (22) for focussing the transmitted signals onto a desired tomographic plane and for focussing reflected signals from the plane onto the transducer (23). The lens arrangement (22) contains rotating prism means (22b, 22c) for causing the transmitted beam to scan the desired tomographic plane and the system incorporates compensating means (23b, 70, 75) for compensating for the deviation, in the focussed beam received at the transducer means, resulting from the rotation of the prism means (22b, 22c) in the time between the passage therethough of the corresponding transmitted and received ultrasonic waves. </p> |
