Influence Of Exposure Factors On X-ray Film Flashcards
1
Q
What does the altering of kv affect
A
- Quality
- Intensity
2
Q
Effects of Quality
A
- Influences the ability of x-ray photons to penetrate matter
- Influences the radiation dose of the patient
- It influences radiographic contrast
- Influences differential attenuation
3
Q
Effects of Intensity
A
- Increase in kv increases the intensity of beam emitted from the peak tube
4
Q
Focal spot
A
Point source of electrons
5
Q
Types of focal spot
A
- fine focus
- Broad focus
6
Q
When is fine focus likely selected
A
- Is selected when geometric factors are likely to limit image quality
- When dealing with small body parts eg fingers
7
Q
Broad focus
A
- permits higher tube loading and is used for examination of bigger body parts
8
Q
Filtration
A
- absorbs low energy x-rays inside the tube
9
Q
Types of filtration
A
- inherent filtration
- Added filtration
10
Q
FFD
A
distance from the x-ray tube to the image receptor
11
Q
Intensity
A
An expression of rate of flow of radiation energy per unit area of cross section of the beam.
12
Q
Relationship between intensity and FFD
A
- an inverse relationship exists, for instance, a doubled ffd will result in decrease in intensity by 1/4
13
Q
Importance of collimation
A
- it reduces the amount of scattered radiation
- It reduces the area covered by the primary beam
- It reduces the volume of patient tissue radiated
14
Q
Sec radiation grid
A
Is a device that is placed on top of the image receptor to absorb scatter radiation while allowing the rest to pass through.
15
Q
The speed of an intensifying screen
A
- is the measure of the luminance that results from a specified exposure to x-rays.
