FLUOROSCOPY ARRT EXAMINATION TEST
2026 FULL QUESTIONS AND VERIFIED
SOLUTIONS 100% CORRECT
⩥ Compton effect Answer: hits the outer electron, incomplete transfer of
energy, electron released and a low energy xray is deflected
⩥ photoelectric absorption Answer: x-ray totally absorbed by inner shell
electron, x-ray overcomes binding energy and knock out the electron and
an outer shell electron takes it place. When the outer electron moves to
its new place, a characteristic x-ray is formed
⩥ what is the product of photoelectric absorption? Answer: electron
flying , characteristic x-ray, and positive ion
⩥ coherent scatter Answer: aka Thompson scatter, Rayleigh scatter or
classical scatter. x-ray is absorbed by entire atom and is sent off in
another direction with no energy loss
⩥ does coherent scatter result in patient dose? Answer: No, this reaction
only causes excitation of the atoms shells, but there is not energy
transfer nor does the x-ray lose energy ( isotropic)
,⩥ what is the chance of coherent scatter occurring? Answer: 5%
⩥ attenuation Answer: the drop of intensity of the beam due to
absorption and scatter
⩥ photoelectric interaction is dependent on Answer: Z^ 3 and 1/E^3
⩥ as photon energy increases there is more Answer: penetration and a
decrease in tissue interactions
⩥ Compton is dependent on Answer: energy level ( the higher it is, the
greater probability of occurrence), electrons/ gram
⩥ attenuation equation Answer: I= Io e^ (-ux)
initial energy x e^( attenuation factor x tissue thickness)= resulting
energy
initial energy- resulting energy= absorbed energy
⩥ u ( tissue attenuation coeffient) is dependent on Answer: keV and
material
⩥ what is the source of free electrons? Answer: cathode
,⩥ what is the cathode made of? Answer: 98% tungsten, 1-2% thorium
⩥ in what direction are electrons accelerated? Answer: cathode to anode
⩥ how do we focus electron? Answer: we use a focusing cup made of
nickel that has a greater negative charge. This negative charge repels and
squishes the electrons that are made from thermionic emission
⩥ how does deceleration occur in electrons? Answer: the closer to the
nucleus the electron is, the more attraction there is and as a result it
slows down faster. More energy is transferred to the xray and it has a
higher energy as well. If the electron is far, it wont slow down as much,
it will lose less energy and will result in a low energy electron.
⩥ what is the cathode filament made of? Answer: Tungsten
⩥ bremsstrahlung interaction Answer: 99% heat, 1% x-ray
aka braking radiation, cathode electrons hit anode electrons. Electron
that are closer to the nucleus slow down more and lose more energy but
create higher energy electrons. Electrons that are farther away slow
down less, lose less energy and create low energy x-rays. They retain
enough energy to keep having more interactions
, (electrons are more likely to hit the outer rim of the anode)
⩥ characteristic interactions Answer: made 2 ways
1)cathode electrons hit anode electrons
2) PE effect from x-ray to electron interactions
⩥ which interactions occur in the tube? Answer: bremsstralung
⩥ what interactions occur in the body? Answer: PE, Compton, Coherent
scatter
⩥ what happens when we increase KeV? Answer: the chance of
Compton effect increases, and the ratio between CS and PE also
increases
⩥ equations for frequency and wavelength Answer: c= speed of light=
3x10^8 m/s
Hertz= cycles/s
frequency = speed of light/ wavelength
v = c/ upside down Y
2026 FULL QUESTIONS AND VERIFIED
SOLUTIONS 100% CORRECT
⩥ Compton effect Answer: hits the outer electron, incomplete transfer of
energy, electron released and a low energy xray is deflected
⩥ photoelectric absorption Answer: x-ray totally absorbed by inner shell
electron, x-ray overcomes binding energy and knock out the electron and
an outer shell electron takes it place. When the outer electron moves to
its new place, a characteristic x-ray is formed
⩥ what is the product of photoelectric absorption? Answer: electron
flying , characteristic x-ray, and positive ion
⩥ coherent scatter Answer: aka Thompson scatter, Rayleigh scatter or
classical scatter. x-ray is absorbed by entire atom and is sent off in
another direction with no energy loss
⩥ does coherent scatter result in patient dose? Answer: No, this reaction
only causes excitation of the atoms shells, but there is not energy
transfer nor does the x-ray lose energy ( isotropic)
,⩥ what is the chance of coherent scatter occurring? Answer: 5%
⩥ attenuation Answer: the drop of intensity of the beam due to
absorption and scatter
⩥ photoelectric interaction is dependent on Answer: Z^ 3 and 1/E^3
⩥ as photon energy increases there is more Answer: penetration and a
decrease in tissue interactions
⩥ Compton is dependent on Answer: energy level ( the higher it is, the
greater probability of occurrence), electrons/ gram
⩥ attenuation equation Answer: I= Io e^ (-ux)
initial energy x e^( attenuation factor x tissue thickness)= resulting
energy
initial energy- resulting energy= absorbed energy
⩥ u ( tissue attenuation coeffient) is dependent on Answer: keV and
material
⩥ what is the source of free electrons? Answer: cathode
,⩥ what is the cathode made of? Answer: 98% tungsten, 1-2% thorium
⩥ in what direction are electrons accelerated? Answer: cathode to anode
⩥ how do we focus electron? Answer: we use a focusing cup made of
nickel that has a greater negative charge. This negative charge repels and
squishes the electrons that are made from thermionic emission
⩥ how does deceleration occur in electrons? Answer: the closer to the
nucleus the electron is, the more attraction there is and as a result it
slows down faster. More energy is transferred to the xray and it has a
higher energy as well. If the electron is far, it wont slow down as much,
it will lose less energy and will result in a low energy electron.
⩥ what is the cathode filament made of? Answer: Tungsten
⩥ bremsstrahlung interaction Answer: 99% heat, 1% x-ray
aka braking radiation, cathode electrons hit anode electrons. Electron
that are closer to the nucleus slow down more and lose more energy but
create higher energy electrons. Electrons that are farther away slow
down less, lose less energy and create low energy x-rays. They retain
enough energy to keep having more interactions
, (electrons are more likely to hit the outer rim of the anode)
⩥ characteristic interactions Answer: made 2 ways
1)cathode electrons hit anode electrons
2) PE effect from x-ray to electron interactions
⩥ which interactions occur in the tube? Answer: bremsstralung
⩥ what interactions occur in the body? Answer: PE, Compton, Coherent
scatter
⩥ what happens when we increase KeV? Answer: the chance of
Compton effect increases, and the ratio between CS and PE also
increases
⩥ equations for frequency and wavelength Answer: c= speed of light=
3x10^8 m/s
Hertz= cycles/s
frequency = speed of light/ wavelength
v = c/ upside down Y
