171 MRO Quizes ANSWERED CORRECTRY || A+ RATED
T/F
Radiographic density is the degree of blackening of an area of film. - Correct Answer T
By definition, radiographic density is the degree of blackening of an area of film.
Which of the following primarily determines the variation in density on the finished radiograph?
- Speed of photons
- Absorption characteristics of the body
- Image receptor
- Type of radiographic unit - Correct Answer Absorption characteristics of the body
Density on a radiographic image is actually the result of absorption characteristics of the body.
A histogram is a: - Correct Answer Processing algorithm to produce an image
Dose creep is a problem with which system? - Correct Answer Digital
The useful range of density in film/screen imaging is represented by which part of the curve? -
Correct Answer Body (straight line portion)
Body: human eye can see
toe & shoulder: transition points
, T/F
mAs controls quantity. - Correct Answer T
mAs controls the number of electrons boiled off of the filament and available for interaction at
the anode to produce x-rays, it is said to control quantity.
Which set of factors will produce the greatest density?
- 50 kVp at 20 mAs
- 60 kVp at 20 mAs
- 70 kVp at 20 mAs
- 80 kVp at 20 mAs - Correct Answer 80 kVp at 20 mAs
All other factors remaining constant, an increase in kVp results in an increase in density.
Therefore, the highest kVp in the list of choices will produce the greatest density.
What percentage of change in kVp is roughly equal to doubling the mAs? - Correct Answer 15%
What happens to density as SID increases? - Correct Answer Decreases
If no adjustments are made, increases in SID cause the same number of photons to be spread
over a larger area, thereby decreasing density
Why does density decrease with use of cones if mAs is not adjusted? - Correct Answer Photons
are removed from the beam
T/F
Radiographic density is the degree of blackening of an area of film. - Correct Answer T
By definition, radiographic density is the degree of blackening of an area of film.
Which of the following primarily determines the variation in density on the finished radiograph?
- Speed of photons
- Absorption characteristics of the body
- Image receptor
- Type of radiographic unit - Correct Answer Absorption characteristics of the body
Density on a radiographic image is actually the result of absorption characteristics of the body.
A histogram is a: - Correct Answer Processing algorithm to produce an image
Dose creep is a problem with which system? - Correct Answer Digital
The useful range of density in film/screen imaging is represented by which part of the curve? -
Correct Answer Body (straight line portion)
Body: human eye can see
toe & shoulder: transition points
, T/F
mAs controls quantity. - Correct Answer T
mAs controls the number of electrons boiled off of the filament and available for interaction at
the anode to produce x-rays, it is said to control quantity.
Which set of factors will produce the greatest density?
- 50 kVp at 20 mAs
- 60 kVp at 20 mAs
- 70 kVp at 20 mAs
- 80 kVp at 20 mAs - Correct Answer 80 kVp at 20 mAs
All other factors remaining constant, an increase in kVp results in an increase in density.
Therefore, the highest kVp in the list of choices will produce the greatest density.
What percentage of change in kVp is roughly equal to doubling the mAs? - Correct Answer 15%
What happens to density as SID increases? - Correct Answer Decreases
If no adjustments are made, increases in SID cause the same number of photons to be spread
over a larger area, thereby decreasing density
Why does density decrease with use of cones if mAs is not adjusted? - Correct Answer Photons
are removed from the beam
