ultrasound Flashcards
ultrasound
longitudinal waves above the upper limit of the audible range
what is a transducer
a device such as a microphone which converts a non electrical signal into a electrical signal
what is the piezoelectric effect
change in volume of a material when a pd is applied across its opposite faces. alternatively it is the production of an induced emf when certain crystals are placed under stress
benefits of ultrasound
no danger with ultrasound
machines are inexpensive and portable
you can obtain real time images of the soft tissue
the ultrasound transducer and the piezoelectric effect
transducer acts as both transmitter and a receiver
-when crystals has a alternating PD applied to them they oscillate at the frequency of the signal and a ultrasound is emitted
