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interactionsw
interactions with matter CH 12
Question | Answer |
---|---|
what is attenuation | number of photons from x-ray beam reduced, x-ray photons loose energy through interaction w/matter |
what is scatter radiation | photons that change direction after they interact w/matter |
what 3 interactions produce scatter and what 1 interaction produces secondary radiation | Rayleigh,thomson,compton-secondary photo electric |
does secondary radiation emitt scatter radiation | no |
name two ways to reduce scatter | colllimate,grid |
what is the most dangerous interaction for a tech and why | compton because it has ability to gain energy |
what reaction totally absorbs incident photon | photo electric effect |
what reactions doesn't occur in diagnostic x-ray range | pair production |
an anatomic part that transmits the incoming incident photon will create an area of | high density on the image |
the most scatter radiation is produced by | comptons |
what scatter radiation is responsible for contrast | photo electric effect |
what kind of radiation is produced after a compton interaction | remnant radiation |
an atomic part that transmits the incoming incident photon is | radiolucent |
what radiation ionize the atom | photo electric and compton |
what impact does scatter radiation have on the radiographic image | produces fog, no useful information |
If an e' is ejected it is | ionized |
as kV increases the percent of x-rays undergoing compton interaction increases or decreases | increases, but photo electron interactions decrease reducing PT dose |
when does scatter increase | with PT thickness and increased field size |
with a higher atomic number in material will you have more or less scatter | less scatter because greater number of photo electric absorption interactions |
attenuation is affected by | type of material ex.bone less attenuation than soft tissue |
why are psoas muscles more demonstated than fat | muscle is more tightly packed causing more absorption |
does photon interactions increase or decrease with increased kV | decrease |
the compton effect usually occurs between | moderate energy x-rays and loosely bound outer electrons |
probability of a compton interaction occurring depends on | density of interacting material |
photo electric effect is most likely to occur with | elements of higher atomic number |
rayleighs and thomson produce modified or unmodified scatter | unmodified scatter |
the frequency of scattered and secondary radiation is | less or equal to primary radiation |