Term
| Interaction responsible for contrast |
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Definition
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Term
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Definition
| the reduction of the number of x-ray photons in a beam as a result of absorption or scatter production |
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Term
| low energy photons interact with: |
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Definition
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Term
| moderate energy photons interact with: |
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Definition
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Term
| high energy photons interact with: |
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Definition
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Term
| Name 5 interactions the occur within the patient |
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Definition
1. Coherent
2. Photoelectric
3. Compton
4. Pair Production
5. Photodisintegration |
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Term
| Photoelectric Interaction |
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Definition
Photon interacts with an atom in the body, interacts with an inner shell and bounces an electron out.
Photon is completely absorbed. |
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Term
| Interaction in which photon is completely absorbed. |
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Definition
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Term
| What determines probability of the PE interaction? |
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Definition
1. Photon energy - low energy=high prob
2. Z# of atom - high Z#=high prob |
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Term
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Definition
| Interaction between an x-ray and and a loosely bound outer-shell electron that results in ionization and x-ray scattering. Energy of incident photon is not completely absorbed, but scattered. |
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Term
| Interaction dependent on Z# |
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Definition
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Term
| Interaction not dependent on Z# |
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Definition
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Term
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Definition
| A low energy photon interacts with an atom and has the same energy going in and going out. Ionization does not occur. Does not have diagnostic value. |
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Term
| Other names for Coherent Scattering |
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Definition
| Classical, Unmodified, Raleigh and Thompson |
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Term
| Interaction in which ionization does not occur |
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Definition
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Term
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Definition
| An interaction in which a high-energy photon hits the nucleus of an atome within the body and is completely absorbed. The result is the ejection of one positron and one negatron. The positron joins with a free electron in an annhilation reaction and 2 photons are emitted. |
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Term
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Definition
| Process by which very high energy x-rays can escape interaction with electrons and the nuclear electric field and can be absorbed directly by the nucleus which causes it to "blow apart". |
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Term
| What energy is required for Pair Production? |
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Definition
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Term
| What energy is required for Photodisintegration? |
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Definition
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Term
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Definition
| The principle that explains the difference in the amount of x-ray absorption between materials, which results in the formation of a radiologic image. |
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Term
| Most scatter in a radiologic image is due to: |
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Definition
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Term
| If the scattered x-ray has the same wavelength and frequency as the incident x-ray, the interaction is called: |
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Definition
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Term
| If the incident photon is completely absorbed when an electron is knocked out of an atom, the interaction is called: |
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Definition
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Term
| What radiation is emitted when an electron drops from an outer shell to an inner shell? |
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Definition
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Term
| In what interaction does the incident photon give only part of its energy to a bound electron? |
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Definition
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Term
| The PE occurs with _____ shell electrons. |
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Definition
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Term
| The Compton Effect occurs with _____ shell electrons. |
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Definition
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Term
| The formula that explains how an electromagnetic wave can disappear and leave 2 particles in its place? |
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Definition
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