a "crystalline" material such as quartz that changes shape
when an electric current is applied creating sound waves and when
struck by sound waves creates electrical currents.
- transducers that are used in detection of blood flow such
as a continuous wave transducer. The CW transducer, also called
a Pedoff transducer, has two separate elements. One element
is always transmitting while the other element is always receiving.
Imaging - transducers that are used to image vascular
structures but also have the capability of using various Doppler
techniques to detect blood flow. This transducer, sometimes called
a duplex transducer, is made up of multiple elements spending
part of the time transmitting and part of the time receiving
sound energy. Continuous wave, pulse wave, ColorFlow,
power Doppler, and b-mode are the various modes that this
type of transducer can perform.
- commercial echocardiographs use ceramics such as barium titanate
or lead zirconate titanate.