transducers
what is Piezoelectric Effect
property of certain crystals to emit
electrical energy when pressure is applied
dynamic range is reported in units of_____?
dB
what is DICOM?
A. Standards for tranducer design
B. standards for patient exposure
C. protocols for two dimensional imaging
D. protocols for medical imaging data transfer
what does tgc stand for
time gain compensation
what is another name for compression?
dynamic range
how is crystal thickness related to frequency?
inversely
unit of measure for frequency
MHz
What does PACS stand for?
picture archiving communications system
if the gallbladder has artifact in it, name 4 ways to clean it up.
focal zone
depth
stand off pad
change transducer
gain
tgc
different window
change frequency
harmonics
auto optimize
name 2 of the 3 primary components of attenuation
reflection
scattering
absorption
name 3 of the components of a transducer
Active Element
Damping Material (backing material)
Matching Layer (facing material )
Wiring
Insulating Case
name 4 artifacts
shadowing
edge shadowing
reverb
mirroring
enhanced through transmission
dropout from broken crystal
hydrostatic pressure of a patient in supine position
zero
what does the damping material of a transducer do?
- limits the crystal from ringing & absorbs any energy emitted in a backwards direction
what does 10-6 symbolize?
micro - ยต - millionth
what is the term used for adjusting imaging parameters after the image is acquire?
post processing
if a drop out artifact from a crystal occurs running lateral from left to right, what kind of transducer are you using?
annular
phasic flow is typically seen which type of vessels
veins
what does the matching layer do?
decreases the impedance difference between the crystal & the skin
amplitude uses what unit of measure?
Pa - pascals
name 3 benefits of a pacs system
image manipulation
post processing
attaching documents
storage of images
universal system for imaging modality comparison
worksheet and other software communications
report viewing
to improve image quality, where should the focal zone be place?
at level of AOI or right below it.
name 4 of the 7 acoustic principles
period
frequency
amplitude
intensity
wavelength
propogation speed