Physics Quiz 4/9/2015 Flashcards Preview

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Flashcards in Physics Quiz 4/9/2015 Deck (18)
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1

an interaction in which a filament electron removes an orbital electron from an atom; to regain stability, an outer-shell electron fill the vacancy, giving up its excess energy as a

Characteristic Interaction

2

an interaction in which a filament electron is attracted to the nucleus, causing it to slow down and change direction. The energy loss is emitted as a

Bremsstrahlung Interactions

3

refers to the total number of x-ray photons in a beam

Beam Quantity:

4


states that the intensity of a beam is inversely proportional to the square of the distance

Inverse Square Law:

5


refers to the penetrating power of the x-ray beam

Beam Quality:

6


refers to those x-ray photons that are transmitted through the body & reach the IR

Penetration:

7


defined as the thickness of absorbing material (aluminum (Al) or aluminum equivalent filtration) necessary to reduce the energy of the beam to one-half its original intensity

Half-value Layer:

8


refers to the x-ray beam as it exits the collimator

Primary Beam:

9


refers to the x-ray beam that remains after interaction with the patient & is exiting the patient to expose the IR

Remnant Beam:

10

graphically illustrates the x-ray beam

Emission Spectrum

11


graphic representation of characteristic x-ray production (straight up, straight down)

Discrete Emission Spectrum:

12


graphic representation of bremsstrahlung x-ray production

Continuous Emission Spectrum:

13

Know how mAs affects Beam quantity?

increase mAs increase quantity

14

How does kVp affect beam quantity?

Varies as the square of the ratio of the change in kVp
If kVp is doubled, the intensity (quantity) increases by a factor of four

15

How does filtration affect beam quantity?

Decreases

16

How does distance affect beam quantity?

Inverse relationship

17

How does kVp affect Beam quality?

Increase kVp, increase quality

18

How does filtration affect beam quality?

Increases