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VTI Rad1 CH 5

QuestionAnswer
Non-image forming radiation that is scattered in all directions because of objects in the path of the xray beam Scatter radiation
Where does scatter come from? Patient/Table or Back Scatter
Radiation that is reflected from behind the image plane back to the image Back Scatter
When will scatter be noticeable on film? The film is darkened and the contrast is decreased.
The measurable difference between two adjacent densities Contrast
Degree of blackness on film Density
Density is influenced by ... mAs and kVp
If the radiograph is too dark what do you change first? mAs
Short Scale/ Black and White/ Bone/ Lower kVp High Contrast
Long Scale/ Soft tissue/ Higher kVp Low Contrast
If you need to increase your mAs, you would increase it by what % 30-50%
If you are overexposed you will lower your mAs and kVp by what percent? mAs is 30%to50% and kVp is by 10-15%
Underexposed? you will increase by what percent? mAs is 30%to50% and kVp is by 10-15%
a device placed between patient and film to absorb scatter grid
Main disadvantage of a grid... absorb some of the primary beam
Grid Patterns Linear and crossed
Grid Types Focused grids, unfocused, and bucky
Two parallel or two focused grids that are set at right angles. Crossed grid
A grid with a parallel center lead strip and inclined strips on either side of that radiate at progessively greater angles. Focused grid
Variation in normal size and shape of anatomic structures due to their position in relation to the xray source and film geometric distortion
Created by: jmorley3
 

 



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