Medical Ultrasound Imaging
Thursday, 21 November 2024
 Info Sheets  Out- side     | 'Dipole' Searchterm 'Dipole' found in 1 article 1 definition [ • ] Result Pages : •
A piezoelectric crystal changes the physical dimensions when subjected to an electric field. When deformed by external pressure, an electric field is created across the crystal. Piezoelectric ceramic and crystals are used in ultrasound transducers to transmit and receive ultrasound waves. The piezoelectric crystal in ultrasound transducers has electrodes attached to its front and back for the application and detection of electrical charges. The crystal consists of numerous dipoles, and in the normal state, the individual dipoles have an oblique orientation with no net surface charge. In ultrasound physics, an electric field applied across the crystal will realign the dipoles and results in compression or expansion of the crystal, depending on the direction of the electric field. For the transmission of a short ultrasound pulse, a voltage spike of very short duration is applied, causing the crystal to initially contract and then vibrate for a short time with its resonant frequency. See also Composite Array, Transducer Pulse Control, and Temporal Peak Intensity. • View NEWS results for 'Piezoelectric Crystal' (1).  Result Pages : | Share This Page     Look Ups |
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