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30 Cards in this Set

  • Front
  • Back
Xrays are generated in the:
CATHODE TUBE
The filament in the cathode are heated, producing:
ELECTRONS
As MA is increased, the electrons are __________ also
INCREASED
The period of time in which electrons (x-ray) are allowed to leave the tube happens in fractions of _________
SECONDS
Electrons and the period for their release determine how many xrays are _________
AVAILABLE
mAs
=number of electrons=number of xrays produced
The _________in the xray tube attracts electrons
anode
The anode has to be able to stand high _____ due to the heat produced by the collision of electrons with the _________
heat; target
Anode
-made of tungsten
-99% of energy is heat
-1% xray
-angled so the xrays exit the metal housing through the window and penetrate the cassette`
Electrons speed is needed to have _______
high-energy impact
-done by applying 1000's of volts across the xray tube
-high voltage produces xrays with high penetrating power
KvP
-controls the penetrating power of the xray
-penetrating power of the xray
-influences density and increased blackness of film
-affects contrast
Density
affected by mAs
Higher the mAs the greater the ________________
density
# of xrays is directly proportional to_________
density of film
The higher the kVp,
the more xrays reach the film surface
Radiographic Contrast
density difference bt two areas on finished radiograph
If the difference is ______then the radiograph has _______contrast
great;high
If there is only a _________ difference then the radiogrpah has _________ contrast
slight; low
Scatter radiation
has an effect on film contrast, especially with HIGH kVp
The use of _____ and fast screens are recommended to minimize scatter radiation
GRIDS
To view film correctly:
-viewed on evenly lit view box in semi-darkened room
-film needs to be positioned on box correctly
box should be clean and all bulbs working
Patients head
top of view box
patient's right side
on viewer's left (like you were shaking hands with pt.)
All lateral views
should face viewer's LEFT saide with spine at TOP
When evaluating rads, ask:
room too light og dark?
proper penetration of film
More exposure will turn the film _________
BLACKER
Underexposure will cause fil to come out too______
LIGHT
If rad is too light then:
INCREASE MAS OR KVP
If penetration is inappropriate the _____ should be changed
KVP
KvP________for a light film; _______for dark film
Increased;decreased