Ultrasonic detection apparatus
An electronic scan type ultrasonic diagnosis apparatus for forming a tomographic image of a patient body is disclosed. In order to focus ultrasonic waves emitted from a probe having an array of electroacoustic oscillators, driving pulses are delayed by a surface wave delay device. The delay device has a surface wave propagating medium, a first transducer including a main surface wave electrode and two sub surface wave electrodes, and a second transducer including an array of surface wave electrodes. The main and sub electrodes of the first transducer are arranged along an arc having a center situating at a middle point of the electrode array of the second transducer and the surface wave electrodes of the second transducer are arranged along an arc having a center situating on a center line connecting the main electrode and the middle point of the second transducer and a radius which is a half of that of the arc along which the main and sub electrodes are arranged. In order to remove the influence of quantization side lobes which appear in an ultrasonic wave beam pattern emitted from the probe, the sub electrodes are spaced equidistantly from the main electrode by such a distance that lines connecting respective sub elements with the middle point make angles + or - theta which are equal to angles between the quantization side lobes and a main lobe of the emitted ultrasonic wave beam pattern.
- Assignee:
- Olympus Optical Co., Limited (Japan)
- Patent Number(s):
- US 4497322
- OSTI ID:
- 5485037
- Resource Relation:
- Patent Priority Date: Priority date 3 Jun 1982, Japan; Other Information: PAT-APPL-384497
- Country of Publication:
- United States
- Language:
- English
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