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Radiology 142 > Interactions > Flashcards

Interactions Flashcards

1
Q

What is the reduction in xray beam intensity as a result of absorption and scatter in matter?

A

Attenuation

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2
Q

What is the number of xray photons?

A

intensity

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3
Q

What is the xrays that leave the patient?

A

Remnant beam

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4
Q

What are the interactions?

A

Photoelectric absorption
coherent sccattering
compton scattering

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5
Q

What is the purpose of a grid?

A

increases contrast

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6
Q

Coherent is a _____ in and ______ out?

A

photon, photon

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7
Q

Does coherent have ionization?

A

no only excitation

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8
Q

During coherent interaction what happens to patient dose?

A

no effect

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9
Q

During coherent interaction what happens to bystander dose?

A

no effect

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10
Q

During coherent interaction what happens to image quality?

A

decreases contrast

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11
Q

What interaction occurs at less than 10 keV?

A

coherent

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12
Q

During coherent: ____ photon, ____ scatter, ____contrast

A

decrease
increases
decreases

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13
Q

Photoelectric is a _____ in and a _____ out?

A

photon, electron

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14
Q

Does photoelectric have ionization?

A

yes, inner shell interaction

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15
Q

What happens to patient dose during photoelectric?

A

increases

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16
Q

What happens to bystander dose during photoelectric?

A

no effect bc there is no scatter

17
Q

What happens to image quality during photoelectric?

A

increases contrast

18
Q

During photoelectric: ____ kvp, ____absorption, ____contrast

A

decrease
increase
increase

19
Q

low kVp= ____ absorption

A

more

20
Q

What interaction occurs when there is more than 10 keV?

A

photoelectric

21
Q

What interaction is the most common?

A

compton

22
Q

What interaction is an outter shell interaction?

A

compton

23
Q

Compton is a _____ in and _____out, _____out?

A

photon
electron
photon

24
Q

Does compton have ionization?

A

yes and scatter

25
Q

How does compton effect patient dose?

A

increases patient dose

26
Q

How does compton effect bystander dose?

A

increases because of the scatter

27
Q

What interaction is the number one source of increased bystander dose?

A

compton

28
Q

How does compton effect image quality?

A

decreases contrast

29
Q

More matter=____ scatter

A

more

30
Q

During compton ____ kvp, ____ scatter, _____ contrast.

A

increase
increase
decrease

31
Q

What interaction is an incoming photon interacts with an entire atom, the energy of that photon is temporarily absorbed but then ejected as a scattered photon?

A

coherent scattering “classical”

32
Q

scatter photon energy is ____ to the energy of the incident xray photon.

A

equal

33
Q

What interaction is a photon enters the atom of the body, xray photon is completely absorbed by an inner shell electron. Electron is then knocked out of orbit causing ionization?

A

Photoelectric

34
Q

What interaction is an xray photon is partially absorbed by a loosely bound outter shell electron, resulting in the electron being knocked out of the orbit causing ionization

A

compton

35
Q

What interaction occurs at all energy levels?

A

compton

Radiology 142 (5 decks)

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