Prime Factors in Radiographic Exposure Flashcards
Which of the following is not a primary factor?
A. Grid
B. KVP
C. MA
D. Time
A. Grid
The factor which properly demonstrates the inverse proportion equal to 100 MA, 1/10 second is?
200 MA, 1/5 second
The factor responsible for accurately penetrating the heart in a chest X-Ray is:
KVP
The unit of power for an X-Ray generator is:
Kilowatt
The primary factor which is manipulated to increase contrast in a radiograph should be:
Increasing the speed of the screen
Generators may either be single phase or three phase. When changing from a single phase unit to three phase unit, what should be done to technique to maintain similar densities?
Decrease MAS
To properly visualize the kidneys in an average routine abdomen or IVP study, the optimal kilovoltage range should be:
65-75
An area of the body that requires low contrast to visualize disease is the:
Chest
Increasing the MAS results in what?
Increased patient dose
True or false:
As the lead content in a grid increases, the efficiency of the grid to absorb secondary scatter radiation increases.
True
Under penetration of a radiograph is caused by using:
Less than required KVP
Contrast in a radiograph is increased by:
Decreased kilovoltage
X-Rays that have changed direction following collision with an atom is called:
Scattered radiation
What factors reduce secondary radiation from reaching the film?
Decreased KVP, beam limiting, increased object film distance, and external filters
One advantage of a three phase X-Ray generator is:
Less voltage fluctuation
Generally speaking, an increase of 10 KVP may be compensated for by allowing changes in exposure time while maintaining constant density:
Cut time by 1/2
If one wished to double the radiographic density using kilovoltage, one would
Increase the KVP by 15%
To obtain a significant increase in density, at lease a ____% increase in MAS is necessary
30%
As the patient size increases, the amount of scatter:
Increases
If radiographic fog is increased, _____ is decreased
Contrast
