| 摘要 |
The ultrasound apparatus contains a focusing device such as a lens or lens system for focusing ultrasound waves. It also contains an ultrasound detector for receiving the focused ultrasound waves. The detector includes a number of elongated piezoelectric detector elements. The longitudinal axis of these elongated elements are curved. The focusing device is an astigmatic focusing device and has a first and a second focal plane. The ultrasound detector is positioned in one of these planes.
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