Review Flashcards
(10 cards)
What is a grid?
A device used to improve contrast of the radiographic image
Most effective device for preventing scatter radiation from reaching the image receptor is the…
Grid
How does the grid improve contrast on the radiographic image?
It improves it by absorbing scatter radiation before it can reach the image receptor
When an x-ray beam passes through the body, one of three things will occur with the primary photons that originated at the target. What are they?
- They will pass through the body unaffected
- Be absorbed by the body
- Interact and change direction
What is grid ratio?
The ratio of the height of the lead strips to the distance between the strips
What is grid frequency?
The number of grid lines per inch or centimeter
What is grid cutoff?
The result of the primary beam being angled into the lead strips
(not aligned)
What is a potential problem with automatic exposure control (AEC)?
Positioning of the part is critical
Primary reason for using a reciprocating grid rather than a stationary grid is that the moving grid…
does not produce grid lines
All of the following are beam-restricting devices EXCEPT the…
- Aperture-Diaphragm
- Aluminum Filter
- Cone
- Cylinder
- Variable Collimator
Aluminum Filter
