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contrast factors

Radiographic contrast and Density

QuestionAnswer
What is the controlling factor for subject contrast? kilovoltage
The Function of contrast on the radiographic image is to Make detail visible
Even though mentioned as a factor, why would kVp be a poor choice to control radiographic density? Changes the scale of contrast
How much must mAs be increased before a noticeable change can be seen with the human eye? 30%
Of the following factors: SID, OID and Focal spot size, which has the greatest affect on density? SID
Adjustment of the mA controls the: Quantity of xrays produced
Of the following factors, which will have the GREATEST affect on contrast. kVp, mAs, time or SID? kVp
Of the factors listed below, the easiest to penetrate is Fat,Muscle,Gas/Air,Cartilage,Bone Gas/Air
In what way would the air gap technique affect radiographic contrast Increase contrast
Of the following statements, which is true? High kVp = High contrast High kVp = Low contrast High kVp = Short scale contrast High kVp = Low density High kVp = Increased patient dose High kVp = Low contrast
Which of the following sets of factors will produce the highest contrast? 50mA @ 3/4 sec@ 50kVP 100mA@ 1/4 sec@ 70kVp 150mA @ .50 sec @ 80 kVp 200mA @ .70 sec@ 120kVP 200mA @ 3/4 sec @ 120kVP 50mA @ 3/4 sec@ 50kVP
Long wavelength radiation will produce a image with High contrast
When detail in radiograph cannot be displayed due to insufficient radiographic density the radiograph is said to be: Underexposed
mAs is obtained by: Multiplying the mA by the time
Short scale contrast can be described as: An image with high contrast
Scatter radiation can destroy the quality of the image. The chief way to control this problem is by decreasing kVp
High kVp yields an x-ray beam of: Short wavelength
The degree of blackening of an image is dependent on all factors in this list EXCEPT one. Which is not a density factor? mAs, kVp, Focal spot size, Speed of the image receptor ,Photon energy reaching the image receptor
Long scale contrast can be changed to short scale contrast by: Decreasing the kilovoltage
When needed, you can decrease you mAs by half, if you increase kVp by: 15%
Density on a radiographic image is: Overall blackness of the image
The primary function of mAs is: Regulate density
When the mA is changed from 300 to 600, what affect will this have on density? Increase density
An addition of a beam restrictor to reduce the field size to 3” would increase: Contrast
Adding 10 kVp to an exposure, would decrease Contrast
Scatter radiation affecting the radiographic image would be increasing: kVp, Grid ratio,Filtration or mA? kVp
A large number of grey densities of varying tonal values is said to possess: Long scale contrast
Created by: Teachinggary