Chapter 2 Flashcards
what does mA stand for
current
what does s stand for in mAs
seconds
The timer on the x-ray generator is
when radiation is produced
what is the maximum kilovolts in vet x-rays `
125
Voltage controls the
penetrability of the x-ray beam
The operating console is referred to as
generator
voltage is
kV
When you increase the Kv you also increase the
penetrating power
What are the 3 components of the X-ray unit
- High voltage transformer
- X-ray generator (control panel)
- X-ray tube
High voltage transformer is located where
beneath the x-ray table
The x-ray generator receives its power from where
high voltage transformer
where does the power end up from the x-ray generator
x-ray tube
Current (mA) controls
Controls the number of photons/density of the image
X-ray generator and high-voltage transformer are matched
as a pair
The Cathode, Two filaments in a focusing cup
Large and small
Made of thoriated tungsten
Boils off electrons when the exposure switch is closed
Focusing cup
Slightly negatively charged
Beveled edges
Space charge effect
Occurs as the electrons are boiled off
The Anode, Tungsten plate with beveled edge
Focal spot
The electron beam is focused to this point
Partner to the cathode Two types
Rotating and Stationary
Rotating
invented to dissipate heat on one spot
Stationary
used in lower kV units (dental units, large animal portables)
Bremsstrahlung interactions
Incoming electron almost hits tungsten electron
Characteristic interactions
Incoming electron ejects inner shell of tungsten atom
Exposure of heat dissipation
1% x-rays, 99% heat
