Transducer Design
Which part of the transducer insulates from electrical shock?
housing
Used for specific location
PW
LATS stands for
lateral, azimuthal, transverse, angular, side-by-side
Which type of transducer has a crystal that has to be manual moved by a motor?
mechanical transducer
At the focus the diameter is equal to
half the diameter of the crystal
Backing material would lengthen or shorten PD & SPL?
shorten
Used for high velocites
CW
Lateral resolution is determined by...
beamwidth
What happens when there is a damaged PZT in a mechanical annular array?
horizontal dropout band
What are the two functions of ultrasound transducers?
transmit electrical energy and receive reflected sound pulses
What is the piezoelectric effect?
When the returning sound wave strikes the crystal and produces an electric field
CW
Considered the third aspect of detail resolution
elevation resolution
First step towards elevation focus
1.5D Array
Fresnel, Fraunhofer
What is the crystal material of choice for ultrasound transducers?
full name
Lead zirconate titanate
With a pulsed mode, what type of relationship exists between crystal thickness and operating frequency?
inversely proportional
Elevation resolution is determined by...
elevation beamwidth
Which array is not common in modern imaging but would be useful for large organs?
vector array
What is phasing?
electrical technique used to steer and focus the beam by using time delays between electrical impulses
Ayeee you just got free points!!
Perioddd!!
What determines propagation speed?
crystal material
Which transducers are used for 2D imaging, Doppler, and color Doppler?
linear phased array, curved linear array, vector, sector phased array
Huygens' Principle states
The hourglass shape of a single crystal is the result of many Huygen's sound wavelets