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Edna3
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| Question | Answer |
|---|---|
| Energy of the incoming photon is increased as compared to the binding energy of the electron | Photoelectric Effect |
| Does photoelectric reach the film? | No... photoelectric is absorption |
| Does photoelectric interactions take place with an inner or outer shell electron? | Inner shell |
| Photoelectric is directly responsible for 2 things. What are they? | contrast and patient dose |
| What interaction within the body is when the incoming photon energy is greater than the binding energy? (alot higher) | Compton Effect (also called compton scattering) |
| Do compton interactions take place with an inner or outer shell electron? | Outer shell |
| What percent of scatter comes from compton interactions? | 99% |
| What are other names for Compton scatter? | Modified Scattering and Incoherent Scattering |
| What interactions take place within the body with a incoming photon that has a lower energy than binding? | Thompson Effect |
| What are other names for Thompson interactions? | Unmodified scattering Coherent scattering Classical scattering |
| Name 3 ways to reduce radiation dose. | minimize exposure time maximize distance use sheilding |
| Where is the least amount of scatter radiation emitted? | At right angles to the Central ray |
| What is the maximum dose allowable for technologist | 5 Roentgens per year (5000 miilirems) |
| What are the different machine phases? | single phase 3 phase high frequency |
| What is the most effective way to reduce patient dose? | collumation |
| If you increase collumation, what happens to density? | decreases |
| Where should you collumate to? | 1/2 in beyond the border of the anatomy of interest |
| What are considered to be the most sensitive organs? | eyes, thyroid and reproductive organs |
| How do intensifying screens affect patient dose? | when screen speed is increased, patient dose decreases (but sharpness is reduced) |
| What is the most commonly used screen speed? | 400 |
| How do technique charts affect repeats? | 30% reduction in repeats |
| What is the minimum distance for tube in C-arm should be from the patients skin? | 12" |
| What is an overexposed film vs a fogged film? | On a fogged film you can't see whites |
| How do you reduce patient dose on larger patients? | Lie prone instead of supine and use a compression paddle |
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