Physics Quiz 4/9/2015 Flashcards
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
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
refers to the total number of x-ray photons in a beam
Beam Quantity:
states that the intensity of a beam is inversely proportional to the square of the distance
Inverse Square Law:
refers to the penetrating power of the x-ray beam
Beam Quality:
refers to those x-ray photons that are transmitted through the body & reach the IR
Penetration:
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:
refers to the x-ray beam as it exits the collimator
Primary Beam:
refers to the x-ray beam that remains after interaction with the patient & is exiting the patient to expose the IR
Remnant Beam:
graphically illustrates the x-ray beam
Emission Spectrum
graphic representation of characteristic x-ray production (straight up, straight down)
Discrete Emission Spectrum:
graphic representation of bremsstrahlung x-ray production
Continuous Emission Spectrum:
Know how mAs affects Beam quantity?
increase mAs increase quantity
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
How does filtration affect beam quantity?
Decreases
