What is the purpose of a grid?
Limits the amount of scatter that reaches the IR (contrast device)
What is the effect on scatter production when we use a grid
NA
Where is the grid located in relation to the patient in the IR? 
In between the patient and IR
What is the active material used in the grid?
Lead
Name two types of grid configurations
Parallel grid
Focus grid
When should a parallel grid best used?
 used at any SID, but the best at long SID
When should a focus grid be used?
Used at 40 SID or a specific SID
Which grid can be used at SID
Parallel
What is the formula for calculating the grid ratio?
Hight/width of interspace=grid ratio
Describe grid latitude 
High grids have low latitude
Low grids have high latitude 
Describe the image if you use a focus grid outside the focal range
Good in the middle but cut off/light on the edges
Describe the image if you use the focus grid upside down
Inverted, good in the middle cut off on the edges 
Describe the image if you use a grid off-level
 You will have grid cut off, light across the whole Xray 
What is the Moire artifact?
Aka aliasing artifact
It’s a CR grid, air, laser lines across Xray
Does crosshatch or linear have more lead?
Crosshatch
