A host computer can have one, two or more probes. A probe can be equipped with 1 piezoelectric chips (such as A-type and M-type ultrasonic diagnostic probes), and can also be equipped with dozens or even thousands of chips, such as real-time ultrasonic diagnostic probes, which are composed of 1 to several chips to work, transmit and receive acoustic energy in turn. Wafers are made of electrostrictive materials and are used to convert electricity, sound or acoustoelectricity, so they are also called transducers. According to frequency, there are single frequency, multi-frequency and broadband probes. Real-time ultrasonic probes are divided into linear array, circular array and convex array according to the arrangement of piezoelectric plates, and have many names such as body surface, cavity and tube according to their uses. Some probes are only a few millimeters long and can enter the coronary artery.
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