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34 Cards in this Set

  • Front
  • Back
tesla =
10,000 gaus
precision
wobble
larmor frecuency
all protons in the nucleus will rotate with the same frequency
gyromatic ratio
a moment of inertia of a spinning nuclei in a magnetic field
type of coils to control pulsing
gradient
coils close to the body part
surface or radiofrecuency coils
coils in the wall that evens out the magnetic field
shim
heavy magnet, .3 T
permanent
magnet that produces lots of heat due to lots of resistance. .02-.4 T
resistive
uses liquid cryogen in thermos like container (dewar)
superconductive
layering of cryogens is
ramping
when boiling point is reached and safety valves release the gas
quenching
stainless steel staples or surgical implants gt hot
tourqing
scans head only
first generation
first to scan whole body
second generation
rotates 360 degrees within gantry. 4 scans per minute.
third generation
15 scans per minute. scans both clockwise and counterclockwise
fourth generation
dedicated to cardiac imaging. also referred to as electron beam tomography
fifth generation
helical/spiral. uses slip ring technology to allow continuous rotation around gantry. entire abdomen scanned in 30-40 seconds
sixth generation
MSCT. entire chest or abdomen scanned in 15-20 seconds.
seventh generation
software allowing data to be changed from transverse to coronal. also used for targeting.
reformation
where the beam is collimated in CT
at the tube and detector
type of detector used in most modern day CT scanners
solid state
3 attributes to detectors
high stability, fast response time, wide dynamic range
motion artifact
result of scan time
when 2 adjacent object have more than 60% difference in attenuation coefficients is also known as
star/interface artifacts
looks like quantum mottle
too much noise not enough data
section interval
difference between scan sections
problem with biplane vascular imaging
increased scatter radiation. eliminated by alternating the exposures.
vascular generators operate at
higher mA and low kVp
pulsing of the beam in a grid controlled tube is done using
third electrode located inside the tube that briefly turns the focusing cup positive.
visualization is of a contrast filled vessel is better with
low kVp
98.6 degrees farenheight is = to _____ degrees celsius
37
biplane imaging refers to
2 c arms 90 degrees from one another