Interactions Flashcards
What is the reduction in xray beam intensity as a result of absorption and scatter in matter?
Attenuation
What is the number of xray photons?
intensity
What is the xrays that leave the patient?
Remnant beam
What are the interactions?
Photoelectric absorption
coherent sccattering
compton scattering
What is the purpose of a grid?
increases contrast
Coherent is a _____ in and ______ out?
photon, photon
Does coherent have ionization?
no only excitation
During coherent interaction what happens to patient dose?
no effect
During coherent interaction what happens to bystander dose?
no effect
During coherent interaction what happens to image quality?
decreases contrast
What interaction occurs at less than 10 keV?
coherent
During coherent: ____ photon, ____ scatter, ____contrast
decrease
increases
decreases
Photoelectric is a _____ in and a _____ out?
photon, electron
Does photoelectric have ionization?
yes, inner shell interaction
What happens to patient dose during photoelectric?
increases
What happens to bystander dose during photoelectric?
no effect bc there is no scatter
What happens to image quality during photoelectric?
increases contrast
During photoelectric: ____ kvp, ____absorption, ____contrast
decrease
increase
increase
low kVp= ____ absorption
more
What interaction occurs when there is more than 10 keV?
photoelectric
What interaction is the most common?
compton
What interaction is an outter shell interaction?
compton
Compton is a _____ in and _____out, _____out?
photon
electron
photon
Does compton have ionization?
yes and scatter
How does compton effect patient dose?
increases patient dose
How does compton effect bystander dose?
increases because of the scatter
What interaction is the number one source of increased bystander dose?
compton
How does compton effect image quality?
decreases contrast
More matter=____ scatter
more
During compton ____ kvp, ____ scatter, _____ contrast.
increase
increase
decrease
What interaction is an incoming photon interacts with an entire atom, the energy of that photon is temporarily absorbed but then ejected as a scattered photon?
coherent scattering “classical”
scatter photon energy is ____ to the energy of the incident xray photon.
equal
What interaction is a photon enters the atom of the body, xray photon is completely absorbed by an inner shell electron. Electron is then knocked out of orbit causing ionization?
Photoelectric
What interaction is an xray photon is partially absorbed by a loosely bound outter shell electron, resulting in the electron being knocked out of the orbit causing ionization
compton
What interaction occurs at all energy levels?
compton
