Density and Contrast Flashcards
What are the two major characteristics of an image that directly influence the diagnostic quality of an X-Ray?
Density/MAS and contrast/KVP
What does density equal?
MAS. The number of silver deposits on an X-ray.
The greater the deposits, the ______ the film
Darker
What does contrast equal?
KVP. The total relationship between one density and another that enables image details to become visible.
Structures of high density in the body include:
Bones and teeth
Which of the following technical factors have a direct effect on radiographic density?
A. KVP
B. MAS
C. Distance
D. Focal spot size
B. MAS
Which percent of change in exposure is required to produce a visible difference on the radiograph?
30%
MA + time =
MAS
Which of the following factors regulates the penetration of the X-Ray beam?
A. KVP
B. Milliamperage
C. Time
D. Distance
A. KVP
Radiographic density will increase:
As the screen speed is increased
Radiographs that demonstrate large differences in density are said to have:
Short scale contrast/high KVP
The prime factor that should be used to regulate density is ________
MAS
The prime factor that should be used to regulate contrast is:
KVP
Which of the following factors reduces the patient dose and improves subject contrast?
A. Filtration
B. Grids
C. Contrast media
D. Beam limiting devices
D. Beam limiting devices
Which of the following technical factors does not affect radiographic contrast?
A. Film type
B. Grid
C. Focal spot size/columniation
D. Processing
C. Focal spot size/columniation
As the source or target film distance increases, the ______ must be increased to maintain the density on the radiograph
MAS
