Unit 7 Production Review and Terms
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27 Terms
Voltage potential is set by _____ selection.
kVp
What is the velocity of the electrons?
1/2 the speed of light
High KE electron stream bombards the ______________ target.
tungsten/rhenium
Why is the target made of tungsten?
its a good thermal conductor
Why is rhenium added to the target?
allows for expansion from heating and cooling, and can withstand high speed rotations
Why does the target rotate?
to help with heat dissipation
X-rays are produced by __________ interaction with _________ atoms.
electron, target
Do all x-rays travel at the same speed?
yes
Do all x-rays have the same energy?
no
In what direction are the x-rays admitted?
all directions
Filtration _________ the beam.
hardens
What does "hardening" the beam mean?
remove low energy photons which increases the average energy of the beam
What is inherent filtration?
filtration from the tube construction (envelope, oil, etc)
What is added filtration?
Any filtration outside the tube and housing (thin sheet of aluminum, silver sided mirror on collimator)
Describe beam quality.
penetrating power, beam energy, controlled by kVp
Describe beam quantity.
tube current, intensity, beam photon number, controlled by mAs
Describe absorption.
transfer of EM energy from photon to biologic tissue (photons that are absorbed so not reach the IR)
Describe attenuation.
reduction of photon number in beam as partial energy is transferred to biological tissue
Describe transmission.
no EM transfer from photon to body
Describe absorbed dose (D).
amount of EM energy absorbed per unit of body mass.
Tube electron energy = ?
maximum x-ray photon energy
Voltage across the tube will ________.
fluctuate
What does it mean if the beam is heterogeneous?
it has many energies
A 100 kVp = max _____ keV electron and max ____ keV photon.
100, 100
The average photon is _______ the energy of the maximum.
1/3
100 kVp = ______ keV average beam energy.
33
The emerging x-ray beam is called _____________.
primary radiation