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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 |
Created by:
mharvey
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