111-Density/Exposure & Contrast Flashcards
Increasing kvp does what to exposure and contrast
Increases exposure
Decreases contrast
Increasing number of pulses in generators does what to exposure and contrast
Increase exposure
Decrease contrast
Increasing mas does what to exposure and contrast
Increases exposure
Nothing to contrast
Using a small focal spot size does what to exposure and contrast
Nothing to both
Using a large focal spot size does what to exposure and contrast
Nothing to both
What does the use of the anode heel effect have on exposure and contrast
Nothing to both
Increasing sid does what to exposure and contrast
Decrease exposure
Nothing to contrast
Decreasing sid does what to exposure and contrast
Increase exposure
Nothing to contrast
Increasing oid does what to exposure and contrast
Decrease exposure
Increase contrast
Decreasing oid does what to exposure and contrast
Nothing to exposure
Decrease contrast
Increasing filtration does what to exposure and contrast
Decrease exposure
Decrease contrast
Decreasing filtration does what to exposure and contrast
Increase exposure
Increase contrast
Increasing collimation does what to exposure and contrast
Decrease exposure
Increase contrast
Increasing amount of irradiated material does what to exposure and contrast
Decrease exposure
Decrease contrast
Increasing differences between atomic number of tissues does what to exposure and contrast
Decrease exposure
Increase contrast
Increasing density of tissue does what to exposure and contrast
Decrease exposure
Increase contrast
Using radiolucent contrast does what to exposure and contrast
Increase exposure
Increase contrast
Using radiopaque contrast does what to exposure and contrast
Decrease exposure
Increase contrast
Additive pathology does what to exposure and contrast
Decrease exposure
Decrease contrast
Destructive pathology does what to exposure and contrast
Increase exposure
Increase contrast
Increasing grid ratio does what to exposure and contrast
Decrease exposure
Increase contrast
What is the controlling factor of brightness
Window level
If you increase filtration, what happens to scatter
Increases
What technical factor causes blooming of the focal spot
Higher mas
What is considered a low subject contrast area
Abdomen
What is considered a high subject contrast area
Chest, extremities
When doubling exposure, the EI will increase by
300
Over and underexposed images do what to contrast
Decrease
Use of compensating filters do what to contrast
Nothing
Exposure errors of ___% can be adjusted by digital processing
+/- 50%
A pixel depth of zero appears
White
If you increase window level, what happens to brightness of the image
Gets darker
If you increase window width, what happens to contrast
Decreases
What is the unit of brightness
Candela
A minimum of ___% change in___ is needed for a visible change in density
30, mas
When is the anode heel effect most noticed
With short sid and large field size
What is quantization
Assigning digital densities to each pixel
What is automatic rescaling
Digital processing to fit actual histogram closer to reference
Use of a compensating filter does what to density
Decrease density
