Fluoroscopy ARRT Exam Study guide
Exam Questions And Answers
what mag modes are available? -
correct answer ✅if you have a 16" II, you can have 12,9,6, and 4.5
"
Compton effect -
correct answer ✅hits the outer electron, incomplete transfer of
energy, electron released and a low energy xray is deflected
photoelectric absorption -
correct 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? -
correct answer ✅electron flying , characteristic x-ray, and positive
ion
coherent scatter -
correct 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
,Fluoroscopy ARRT Exam Study guide
Exam Questions And Answers
does coherent scatter result in patient dose? -
correct 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? -
correct answer ✅5%
attenuation -
correct answer ✅the drop of intensity of the beam due to
absorption and scatter
photoelectric interaction is dependent on -
correct answer ✅Z^ 3 and 1/E^3
as photon energy increases there is more -
correct answer ✅penetration and a decrease in tissue interactions
Compton is dependent on -
correct answer ✅energy level ( the higher it is, the greater
probability of occurrence), electrons/ gram
,Fluoroscopy ARRT Exam Study guide
Exam Questions And Answers
attenuation equation -
correct 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 -
correct answer ✅keV and material
what is the source of free electrons? -
correct answer ✅cathode
what is the cathode made of? -
correct answer ✅98% tungsten, 1-2% thorium
in what direction are electrons accelerated? -
correct answer ✅cathode to anode
how do we focus electron? -
correct answer ✅we use a focusing cup made of nickel that has a
, Fluoroscopy ARRT Exam Study guide
Exam Questions And Answers
greater negative charge. This negative charge repels and squishes
the electrons that are made from thermionic emission
how does deceleration occur in electrons? -
correct 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? -
correct answer ✅Tungsten
bremsstrahlung interaction -
correct 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)
Exam Questions And Answers
what mag modes are available? -
correct answer ✅if you have a 16" II, you can have 12,9,6, and 4.5
"
Compton effect -
correct answer ✅hits the outer electron, incomplete transfer of
energy, electron released and a low energy xray is deflected
photoelectric absorption -
correct 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? -
correct answer ✅electron flying , characteristic x-ray, and positive
ion
coherent scatter -
correct 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
,Fluoroscopy ARRT Exam Study guide
Exam Questions And Answers
does coherent scatter result in patient dose? -
correct 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? -
correct answer ✅5%
attenuation -
correct answer ✅the drop of intensity of the beam due to
absorption and scatter
photoelectric interaction is dependent on -
correct answer ✅Z^ 3 and 1/E^3
as photon energy increases there is more -
correct answer ✅penetration and a decrease in tissue interactions
Compton is dependent on -
correct answer ✅energy level ( the higher it is, the greater
probability of occurrence), electrons/ gram
,Fluoroscopy ARRT Exam Study guide
Exam Questions And Answers
attenuation equation -
correct 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 -
correct answer ✅keV and material
what is the source of free electrons? -
correct answer ✅cathode
what is the cathode made of? -
correct answer ✅98% tungsten, 1-2% thorium
in what direction are electrons accelerated? -
correct answer ✅cathode to anode
how do we focus electron? -
correct answer ✅we use a focusing cup made of nickel that has a
, Fluoroscopy ARRT Exam Study guide
Exam Questions And Answers
greater negative charge. This negative charge repels and squishes
the electrons that are made from thermionic emission
how does deceleration occur in electrons? -
correct 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? -
correct answer ✅Tungsten
bremsstrahlung interaction -
correct 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)
