| 摘要 |
<p>The invention is concerned with generating and directing ultrasound over predetermined regions of a body, such as a programmed sequence of target points. A plurality of side-by-side tapered piezoelectric transducer elements (100-1 to 100-n) are provided. Means (170) are provided for energizing the transducer elements with electrical energy having a variable frequency. The frequency of the electrical energy is varied to change the direction of the ultrasound produced by the transducer elements. In the preferred embodiment of the invention, a processor (150) is responsive to a coordinate of an input target point for controlling the variation of frequency. In one form of the invention, means (180) are provided for varying the relative phases of the electrical energy applied to the transducer elements. In this form of the invention, the processor means is also responsive to at least another coordinate of the input target point for controlling the variation of the relative phases. In another form of the invention, means (580) are provided for selectively enabling at least one of the transducer elements. In this embodiment, each of the transducer elements has an associated focusing lens, and the processor is responsive to a coordinate of the input target point for controlling the selective enablement. </p> |
