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Advanced Image Aquisition > Secondary Radiation Interactions > Flashcards

Secondary Radiation Interactions Flashcards

1
Q

Photo disintegration

A

High energy incident photon strikes nucleus

All energy absorbed by nucleus and nucleus emits nuclear fragment and destroys atom

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2
Q

Photo disintegration occurs at what keV

A

10 MeV

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3
Q

Pair production occurs at what keV?

A

1.02 MeV

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4
Q

Pair production

A

Incident photon comes close to nuclear field and loses all energy
Energy of incident photon converted to matter as negation and positron

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5
Q

What is the annihilation reaction?

A

Converting matter back to energy

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6
Q

Compton scattering

A

Modified scatter
Incident photon removes outermost shell electron and proceeds as scatter
Results in recoil electron

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7
Q

What increases the probability of Compton?

A

As X-ray photon energy increases

As kV increases

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8
Q

What is the formula for Compton?

A

Ei=Es+Ebe+Eke

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9
Q

Photoelectric absorption

A 
Incident photon is absorbed when it knocks out an inner shell electron
Results in photo electron 
Results in characteristic cascade 
Patient dose
Gives us white on images
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10
Q

What increases the probability of photoelectric absorption?

A

When X-ray photon energy is near binding energy
When atomic number of absorber is higher
Incident photon energy must be greater than inner shell binding energy
Probability decreases as energy increases

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11
Q

What is photoelectric absorption mostly dependent on?

A

Atomic number of absorber

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12
Q

What is the formula for photoelectric absorption?

A

Incident photon energy=electron binding energy+ photoelectron energy
Ei=Ebe+Eke

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13
Q

Coherent scattering

A

Unmodified scatter
Incident photon causes electron of atom to vibrate
Atom releases scatter photon with same energy as incident photon in different direction
No energy lost
Doesn’t interact with nucleus just changes direction

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14
Q

What keV does coherent scatter occur?

A

10 keV

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15
Q

Thompson coherent scatter

A

Involves single electron

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16
Q

Rayleigh coherent scattering

A

Involves all electrons

17
Q

Attenuation is dependent On:

A

X Ray energy

Body atomic #

18
Q

What is attenuation?

A

Reduction in quantity of X-rays as the beam passes through matter

19
Q

Transmitted X-rays

A

Do not interact with matter
Dark images in image
Amount of transmitted are increased when kV increases

20
Q

Photoelectric interactions decrease when kV:

A

Increases

Advanced Image Aquisition (7 decks)

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