Transducers Flashcards
A property of certain materials to create a voltage when pressure is applied or when the material is mechanically deformed is known as __________?
Piezoelectric effect
___________ is any device that converts one form of energy into another.
A transducer
PZT, ceramic, active element, and crystal are all other names for what?
Piezoelectric material
What happens when piezoelectric material is heated above 360°C?
It loses its piezoelectric properties, it is depolarized.
Complete destruction of all living microorganisms by means of exposure to heat, chemical agents, or radiation?
Sterilization
This term refers to the application of a chemical agent to reduce or eliminate infectious organisms on an object, such as a transducer.
Disinfection
Should a transducer be disinfected or sterilized?
As a rule, transducers should be disinfected using Cydex or other cold germicide’s, such as Glutaraldehyde. Transducer should never be sterilized using either dry heat, moist heat, or chemicals because this could damage the transducer. Do not use alcohol as a disinfectant.
How thick is the active element of the transducer?
1/2 wavelength
What component of a transducer protects the internal components from damage and insulates the patient from electrical shock?
The case
This component is how the active element in a transducer obtains the electrical connection so that the voltage from the system can excite the crystal thereby producing sound during transmission.
The wire
This component of the transducer has an impedance between those of the skin and the active element to increase the percentage of transmitted ultrasound between the active element and the skin.
Matching layer
The impedance of ________ is in between those of the matching layer and the skin to further increase the efficiency of sound transmission.
Gel
How thick is the matching layer?
The matching layer is 1/4 wavelength thick.
Because short pulses create better images, a material is bonded to the active element to reduce it’s ringing. This material is known as what?
Damping element or backing material
These types of transducers do not require backing material…
Continuous wave transducers do not require damping material.