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mAs and kVp

Terms in this set (131)

When mAs increases, what happens to the quantity of radiation?
Quantity increases
What happens when mAs is too low?
Quantum noise
What happens when mAs is too high?
increases patient dose
What is altered during image processing?
brightness of digital image
What happens if the exposure value or EI number falls outside of the range?
image quality and patient dose
In film screen IR, mAs controls what?
mAs controls density
When mAs is increased, what happens to density?
mAs increases, density increases
How much to you need to change the mAs to see a visually difference?
30% increase or decrease to see visual difference
How much you need to change for a repeat with density?
double mAs to get correct density
What is the relationship between mA and time?
inversely proportional, when maintains the same mAs
How do you get the margin of error?
15% up or down from the original
Increasing and decreasing kVp changes what?
radiation exposure and contrast
how does kVp affect density?
it directly affects density
What is 15% increase, the same as?
doubling the mAs
What does low contrast look like?
more grays
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