8/27: Factors Controlling X-Ray Beam Intensity Flashcards
1
Q
- The total amount of energy contained in the x-ray beam
A
Intensity
2
Q
- Intensity =
A
a. Quantity x Quality
3
Q
- The number of photons in the beam
A
a. Quantity
4
Q
- “Quantity” is primarily related to ____ and ____ and less so by tube voltage (kVp)
A
a. Tube current
b. Exposure time
5
Q
- This is the average energy in the x-ray beam
A
a. quality
6
Q
- Quantity is expressed as
A
a. Current (mA) x Time (sec) → mAs
7
Q
- This is controlled primarily by the tube voltage (kVp)
A
a. Quality
8
Q
- X-ray of the beam is
A
a. Heterogenous
9
Q
- What are the 6 factors that control the x-ray beam intensity?
A
a. Tube voltage
b. Exposure time
c. Tube current
d. Filtration
e. Collimation
f. Source-receptor distance
10
Q
- As the tube voltage increases, what happens to the number of photons generated?
A
a. Increases (quantity)
11
Q
- As the tube voltage increases, what happens to the mean energy of photons?
A
a. Increases (quality)
12
Q
- As the tube voltage increases, what happens to the maximum energy of photons?
A
a. increases
13
Q
- As the tube voltage increases, what 3 things occur?
A
a. Increase # of photons
b. Increase mean energy of photons
c. Increases maximum energy of photons
14
Q
- As exposure time increases, what happens to the number of photons generated?
A
a. Increase (quantity)
15
Q
- As exposure time increases, what happens to the mean energy of photons?
A
a. Quality unchanged
16
Q
- As exposure time increases, what happens to the maximum energy of photons?
A
a. Quality unchanged
17
Q
- The tube current is represented as
A
mA
18
Q
- As mA increases, what happens to the number of photons?
A
a. Increases (increased quantity)
19
Q
- As mA increases, what happens to the mean energy of photons?
A
a. Remains unchanged
20
Q
- As mA increases, what happens to the maximum energy of photons?
A
a. Remain unchanged
21
Q
- This selectively removes long wavelength (low energy) x-rays
A
a. Filtration
22
Q
- Kind of x-rays does filtration remove?
A
a. Long wavelength (low energy)