Card Set Information
chapter anatomy ray machine
chapter 2 flashcards
what are the 5 elements needed for x-ray production?
1. source of electron
2. a method to accelerate those electrons
(make them move faster or slower)
3. obstacles free path for electrons to travel thru
4. need a target on the anode that those electrons are going to hit
5. need a vacuum (glass envelop) so that electtrons can pass thru without being defected
what is the charge for a cathode?
"Cathy is always negative"
what is the charge for an anode?
Cathy is always negative "and that is positively anoding"
where are the electrons generated?
what is the filament?
a lightbulb that gives off electrons when its heated
what are you able to manipulate with the electrons?
how many electrons and how powerful they are
what does the collimators do?
make the x-ray beam smaller or wider
increases or decreases the primary beam
a beam limiting device
what does it mean when you say that the led is radio opaque?
x-rays can not go thru it
what direction can you move the x-ray tube?
up and down or side to side
what generates the x-ray beams?
the x-ray tube
what determines how much electrons and how powerful they are?
how much energy we give to the filament
what does the cathode produce?
a filament which heats up
what is the filament made up of?
where is the focal spot located?
what is the anode made of?
are you able to control the focal spot?
are anodes stationary or rotating?
both but most are rotating which helps dissipate heat
the intensity of the x-ray beaam is not uniform
it is more intense toward the cathode side
this is an advantage when radiographing the thorax of a large dog
where should you put the thickest part?
towards the cathode side
area of the target in which the electrons collide
the smaller the focal spot...
the better the clarity
the larger the focal spot...
the more shadow unsharpness you get
which anodes have a larger focal spot and why?
stationary for the heat
it can't spin and can't dissipate heat so the focal spot has to be larger
which anode have smaller focal spots and why?
rotating anodes because of heat dispersion
how can the cathode fail?
filament can burn up and fall apart
how can the anode target fail?
target on the anode can get zapped
how can the anode bearing fail?
because the anode spins on the bearing and can go bad
what part of the tube can fail to work?
true or false collimation decreases scatter radiation?
which one is more intense the primary beam or scatter radiation
primary beam- never go under the primary beam
what is the primary beam
the part that lights up
what does mA control
the number of x-rays
what is kVp?
the penitrating power of x-ray
how powerful they are
what do you do if there is movement for example breathing
have a shorter exposure time
exposure button- 2 stage exposure button