Product of X Rays Part II 9/7/2021 Flashcards
What factors will modify/control x-ray beam intensity?
- Tube voltage
- Exposure time
- Tube current
- Filtration
- Collimation
- Source-receptor distance
If KvP increases from 80 to 90, what will also increase?
Energy and Average energy of the beam will also increase
go over this slide again
Incr in vol will incr __
Quantity and quality
increase from 1 sec to 2 sec will result in
incr in amount of x rays
if you double the ma you double the number
(2.Exposure time slide)
Changing exposure time will
only change number of photons generated (increase)
but not
mean energy or maximum energy of photons (quality unchanged)
….
.
Why are low energy photons removed?
can’t go through the patient,
will only increase the dose
What is filtration?
Selectively removing long wavelength (low energy) x-rays
Why do we only want high energy?
because it will go through the patient
What happens as filtration increases?
As filtration increases:
o Number of photons decreases (reduced quantity)
o Mean energy of photons increases (increased quality)
o Maximum energy of photons is unchanged
How do you increase filtration*?
Add more aluminum disks????*****
What is total filtration?
Summation of inherent and added filtration
What is collimation?
Collimation restricts the size and shape of the beam
What happens during collimation?
o Number of photons decreases
o Mean energy of photons is unchanged
o Maximum energy of photons is unchanged
