x-ray interactions with matter

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8 Terms

1
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Attenuation

X-ray photons interacting with matter

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3 processes of X-ray photon

1) transmission without any interaction

2) total absorption

3) scatter


3
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Total absorption

Photon interacts with inner shell e- , all of photon energy is absorbed by atom. Results in patient dose & brighter areas on image


4
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Scatter

Photon interacts with outer Shell e- , photon loses some energy & changes direction.results in tech dose & undesirable exposure to image receptor



5
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Image production

Image results from difference between rays transmitted & rays absorbed

Referred as differential absorption

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Transmitted rays

Do not interact with matter but provide dx info

Structures are radiolucent (dark areas)

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Photoelectric interaction

Provides dx info

Represents radiopaque (bright/white areas)

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Compton scatter

No useful info to radiographic image

Causes undesirable noise on image