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Density
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MRO module 4

QuestionAnswer
Density The overall amount of blackening on a radiograph; also called optical density or radiographic density
Contrast The differences in density on adjacent areas of the radiograph
What determines the energy of the x-ray beam? kVp
mAs literally controls the current through the x-ray tube. T or F? True
In general, which kVp is appropriate for a very thick and dense anatomic area to ensure penetration? 40, 50, 60, 70 70kVp
The level or degree of penetration of the x-ray beam is a primary factor in determining the scale of contrast. T or F? True
mAs should be used to control which of the following. 1)Contrast 2)Scatter 3)Density? Density
kVp affects which of the following. 1)Scatter 2)Patient dose 3)Density 4)All of the above? All of the above
Aluminum equivalent A measurement of the filtering capacity of a filter comparing it to the filtration provided by aluminum
Grid ratio The ratio between the height of the lead strips in a grid and the width of the interspace material between them
Intensifying screen A device that converts x-ray photons to light photons to help create the latent image on the film, thereby reducing the x-ray exposure required
What are the standard distances used in general radiography? 40 and 72
What is the purpose of a grid? Absorb scatter
Convert 24 mAs used for slow-speed screens to a mAs appropriate for fast screens? 6mAs. (x=24x1/4) (new mAs=old mAs x old speed factor/new speed factor)
Increasing the speed screen allows for a reduction in the mAs needed for a given projection. T or F? True
If 20mAs is used as a non-grid technique, what mAs should be used with an 8:1 grid? 80mAs. (x=20x4/1) (new mAs=old mAs x new bucky factor/old bucky factor)
If 20mAs is used at a 40-inch SID, what mAs should be used at 72inches to maintain density? 64.8mAs or round to 65mAs (new mas=(72/40)^2 x 20) (new mas=3.24x20) (64.8)
If a 14x17 inch field is collimated to a 9x9 inch field with no other changes, what will happen to density? Decrease
Fixed kVp technique chart A technique chart in which the kVp stays the same but different mAs selections are used for patients of different thickness
Variable technique kVp chart A technique chart in which the mAs stays the same but different kVp selections are used for patients of different thickness
What increases voltage to kilovoltage in the x-ray circuit? Step-up transformer
All photons produced in an x-ray beam will have the same ability to penetrate. T or F? False
In the filament circuit, voltage is stepped down before passing to the filament. T or F? True
mAs controls density by controlling what? Number of electrons boiled off of the filament.
In general, we try to keep OID as large as possible. T or F? False
Grid ratio is the expression of the relationship between the lead strips and the interspace material. T or F? True
When compared to NOT using intensifying screens, use of a screen reduces patient dose. T or F? True
The use of precise collimation helps to reduce scatter reduction. T or F? True
The infant and elderly patient may require a decrease in technique from the average. T or F? True
The selection of kVp is based on the desired scale of contrast and penetration of the part. T or F? True
Created by: volcomgrl12
 

 



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