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RADT 1075 Final Exam Questions and Answers
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RADT 1075 Final Exam Questions and Answers
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RADT 1075 Final Exam Questions andAnswers
If you increase density/receptor exposure, density is - Answer -increased
The greatest factor in the production of scatter radiation is - Answer -patient thickness
If you increase beam restriction/collimation, what happens to density/receptor
exposure? - Answer -Decreases
Which generator produces the greatest amount of radiographic density per mAs? -
Answer -a high-frequency generator
Which factor influences the average energy of photons reaching the IR? - Answer -kVp
The minimum change necessary to cause a visible shift in density is ___% of mAs. -
Answer -25-35
To effectively take advantage of the anode heel effect, where should the thicker part of
the anatomy be placed? - Answer -over the cathode
All of the following will increase radiographic film density EXCEPT - Answer -increased
dryer temperature
Which factor influences the number of photons reaching the IF? - Answer -mAs
The effect of mAs upon IR exposure is - Answer -directly proportional
The relationship between exposure and SID is - Answer -inversely proportional to the
square of the distance
A change in kVp, as an exposure factor, affects - Answer -average beam energy, the
amount of scatter production, and beam intensity
The density maintenance/direct maintenance formula mathematically resembles the -
Answer -inverse square law
If you decrease kVp, what happens to density/receptor exposure? - Answer -decreases
,As you analyze your image, you come to the conclusion that it must have more
exposure. As a general rule, you should increase - Answer -mAs by 2x
Which of the following has NO impact on receptor exposure? - Answer -focal spot size
Which of the following has NO impact on radiation exposure to the patient? - Answer -
Focal spot size
Which statement is FALSE? - Answer -As mAs decreases, exposure increases.
The air gap technique can be used as an alternative to: - Answer -Grids
In the event of making a single exposure that is critical to the exam success, most
experienced technologists will - Answer -overexpose the IR slightly, provide enough
exposure to permit viewing with a bright light or adequate histogram.
The grid conversion factor for a 12:1 grid is: - Answer -5
Which rule is used as a guide to maintain the same density when kVp changes? -
Answer -15% rule
A severely underexposed image will - Answer -be unable to visualize recorded detail
If a particular radiographic exposure requires 50 mAs and the 400 mA station is
selected, what exposure time is required? - Answer -1/8 second
Because of the "heel effect", x-ray beam intensity - Answer -is greater under the
cathode side of the tube
Image brightness on an image display monitor is controlled by - Answer -window level
If you change the focal spot from small to large, what happens to density/receptor
exposure? - Answer -nothing happens
A chest radiograph is produces with sufficient optical receptor exposure using 10 mAs
at 72 inches. If the same radiograph is performed at 44 inches SID, what new mAs
should be used to produce the radiograph with the same receptor exposure? - Answer -
3.7 mAs
The anode heel effect is more pronounced with - Answer -a 10 degree target angle
The optical density range visible to the human eye is - Answer -0.25 to 2.50
The 15% rule changes - Answer -contrast and density
, Most radiographers will use more exposure than required for a procedure. This does
what to patient exposure? - Answer -increases patient exposure
The brightness of the image on a viewing monitor is - Answer -a function of the monitor
The principal controlling factor of radiographic image density is - Answer -mAs
increasing kVp from 85 to 98 kVp - Answer -15% rule
direct relationship between mAs and distance - Answer -density maintenance formula
require an increase in mAs as ratio increases - Answer -radiographic grids
affected by photographic properties of image - Answer -visibility of detail
controls x-ray beam quantity - Answer -mAs
variation in beam intensity along the long axis of beam - Answer -anode heel effect
small and large - Answer -focal spot size
controls the average energy of the x-ray beam - Answer -kVp
In order to reduce patient entrance skin exposure (ESE), higher kVp exposures are a
consideration. It is important to remember that - Answer -kVp values that are too high
produce more scatter and reduce contrast
A radiograph with few shades of gray exhibit - Answer -high contrast
After completing a radiograph using 27 mAs at 90 kVp, the image demonstrates
adequate overall density but an area that is under penetrated. In order to produce an
optimum image in terms of contrast and penetration, the repeat image should be taken
at - Answer -27 mAs and 100 kVp
The concept of contrast as it is displayed on a soft-copy monitor for digital images is
described as - Answer -dynamic range
As the slope of the D log E curve _______, contrast _______. - Answer -increases,
increases.
As tissue density increases, the amount of scatter ______, which also results in a
_________ in contrast. - Answer -increases, decreases
As kVp increases, the percentage of Compton interactions _______ and contrast
______. - Answer -increases; Decreases
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