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47 Cards in this Set

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RIPPLE EFFECT AND GENERATORS
Single phase: 100%
3rd phase: 10%
HF: 1%
WHICH OF THE FOLLOWING METHODS IS USED TO DISIPATE HEAT?
A LARGE FOCAL SPOT
LARGER DIAMETER ANODE
x-ray interactions with matter:
compton and phtoelectric are inteactions between x-ray and eelctron cloud
classic scattering
is when low energy x-ray phtons interact with electron atom
minimal problem
redirected photon also called
scattered photon
compton interaction:
: (scatter) comes into patient and is misdirected
which of the following x-ray interactions with matter reslts in release of signficant secondary radiation
compton interaction
what results in complete absorption of x-ray when interacting with matter?
photoelectric
compton interaction affects the film by causing what in contrast
loss of contrast
within the diagnostic ragne of x-ray energies which interaction predominates as phton erngy inceases?
decreases
which interaction predominates as photon energy increases
compton interaction
LOW ENERGY OR HIGH ENERGY X-RAYS MORE LIKELY TO INTERACT WITH MATTER
LOW
HALF VALUE LAYER
CHARACTERISTIC OF OBJECT BEING X-RAYED: THIS IS THE DEPTH IN WHCIH X-RAY BEAM CAN PENETRATE BEFORE ITS ENERGY IS REDUCED TO ONE HALF OF ITS ORIGINAL VALUE .

LEAD HAS SMALL hlv
MUSCLE HAS LARGE HLV BECAUSE PHOTONS CAN GET TO IT
RELATIONSHIP OF ATOMIC NUMBER AND PHOTOELECTRICL INTERACTIONS
INCREASED ATOMIC NUMBER RESULTS IN INCREASE PROBIBILITY OF PHTOELECTRIC EFFECT
RELATIONSHIP OF KVP AND HALF VALUE LAYER
INCREASE KVP RESULTS IN INCREASE HALF VALUE LAYER
WHAT IS THE LOSS OF X RAY BEAM INTENSITY FROM ABSORPTION AS WELL AS FROM SCATTERING
ATTENUATION
less than 40 kvp: = less or more compton
less comton
(exposure)for x-ray or gamma ray ionization in air only is
roentgen
ejergy deposited by any type of radiation in any material
is Rad
biologcial effect cause by any radiation in living organism
rotengen equivelent mammal (Rem)
milliamperage (mA) is related to time how?
inversly proportional"
shorter exposuretime=higer mA
three cardinal principles;
1. time
2. distnace
3. sheilding
listed in deceasing and pracial order
radiation aand mAs how are they related
directly related:
twice mAs =twice radiation
use of grids increase or decrease dose
increase dose of patent because so much of the radiation is removed before it reaches film.
what kind of radiatin does roentgen unit apply
gamma and x-ray
RIPPLE EFFECT AND GENERATORS
Single phase: 100%
3rd phase: 10%
HF: 1%
WHICH OF THE FOLLOWING METHODS IS USED TO DISIPATE HEAT?
A LARGE FOCAL SPOT
LARGER DIAMETER ANODE
x-ray interactions with matter:
compton and phtoelectric are inteactions between x-ray and eelctron cloud
classic scattering
is when low energy x-ray phtons interact with electron atom
minimal problem
redirected photon also called
scattered photon
compton interaction:
: (scatter) comes into patient and is misdirected
which of the following x-ray interactions with matter reslts in release of signficant secondary radiation
compton interaction
what results in complete absorption of x-ray when interacting with matter?
photoelectric
compton interaction affects the film by causing what in contrast
loss of contrast
within the diagnostic ragne of x-ray energies which interaction predominates as phton erngy inceases?
decreases
which interaction predominates as photon energy increases
compton interaction
LOW ENERGY OR HIGH ENERGY X-RAYS MORE LIKELY TO INTERACT WITH MATTER
LOW
HALF VALUE LAYER
CHARACTERISTIC OF OBJECT BEING X-RAYED: THIS IS THE DEPTH IN WHCIH X-RAY BEAM CAN PENETRATE BEFORE ITS ENERGY IS REDUCED TO ONE HALF OF ITS ORIGINAL VALUE .

LEAD HAS SMALL hlv
MUSCLE HAS LARGE HLV BECAUSE PHOTONS CAN GET TO IT
RELATIONSHIP OF ATOMIC NUMBER AND PHOTOELECTRICL INTERACTIONS
INCREASED ATOMIC NUMBER RESULTS IN INCREASE PROBIBILITY OF PHTOELECTRIC EFFECT
RELATIONSHIP OF KVP AND HALF VALUE LAYER
INCREASE KVP RESULTS IN INCREASE HALF VALUE LAYER
most radioluscent
air
everything else remaining constant if you increase FFD or move the tube away from the film will your image have more or less penumbra?
h. You will have less. This is one reason why you shoot chest films at 72”, because you want to have as much detail as possible.
you increase the object film distance, ( distance between the patient and the film) you get
magnification
Focus Cup:
on the cathode the filaments are inside a little indentation: this focuses the electrons toward the anode.

The purpose of the focusing cup is to direct electrons not photons to the anode
filtration is inherent in the tube because of tube made of
glass
radiopaque (x-ray cannot get through) water or fat
water
purpose of grid:
decrease amount of scatter