27 Questions
What is the primary controller of radiographic density in radiography?
mAs
What happens to exposure if the mA is doubled?
It doubles
What is the effect of increasing kVp in radiography?
Increases density
What is the primary controller of radiographic contrast in radiography?
kVp
What is the product of mA and exposure time in radiography?
mAs
What is the effect of doubling the exposure time in radiography?
Doubles the dose and exposure
What is the effect of doubling or halving the kVp in radiography?
Extreme changes in exposure
What is the distance between the tube target and the IR called in radiography?
SID
What is the effect of a longer SID in radiography?
Decreases the intensity of the x-ray beam
What is the primary controller of radiographic density in radiography?
mAs
What happens to exposure if the mA is doubled?
It doubles
What is the effect of increasing kVp in radiography?
Increases density
What is the primary controller of radiographic contrast in radiography?
kVp
What is the product of mA and exposure time in radiography?
mAs
What is the effect of doubling the exposure time in radiography?
Doubles the dose and exposure
What is the effect of doubling or halving the kVp in radiography?
Extreme changes in exposure
What is the distance between the tube target and the IR called in radiography?
SID
What is the effect of a longer SID in radiography?
Decreases the intensity of the x-ray beam
Which factor is the primary controller of radiographic density?
mA
What is the effect of doubling the exposure time in radiography?
Doubles the dose and exposure
What is the effect of doubling the mA in radiography?
Doubles the exposure and dose
What is the primary controller of the penetration of x-rays in radiography?
kVp
What is the effect of changing the kVp in radiography?
Affects the quantity of exposure to the IR
What is the relationship between mAs and patient dose in radiography?
Directly proportional
What is the effect of doubling or halving the kVp in radiography?
Extreme changes in exposure
What is the primary controller of radiographic contrast in radiography?
kVp
What is the effect of increasing the SID in radiography?
Decreases the intensity of the x-ray beam
Study Notes
Factors affecting exposure and dose in radiography
- Changes in mA affect the rate of exposure and quantity of exposure to the IR.
- Exposure is directly proportional to mA, and doubling the mA doubles the exposure and dose.
- Exposure time controls exposure to the IR, and doubling the exposure time doubles the dose and exposure.
- Milliampere-seconds (mAs) is the product of mA and exposure time and is the primary controller of radiographic density.
- The quantity of exposure and patient dose are directly proportional to mAs.
- Kilovoltage (kVp) controls both the quality and quantity of the x-ray beam and is the primary controller of the penetration of x-rays.
- The kVp also affects the quantity of exposure to the IR, and increasing the kVp increases the density.
- Changes in exposure are not directly proportional to kVp, and doubling or halving the kVp would result in extreme changes in exposure.
- kVp should not be used to control radiographic density but is the primary controller of radiographic contrast.
- Each body part that is radiographed will have a predetermined kVp assigned to it based on the penetration and contrast required.
- The distance between the tube target and the IR, known as the source-image receptor distance (SID), affects the intensity and quantity of x-rays.
- A longer SID decreases the intensity of the x-ray beam, resulting in fewer photons reaching the IR and less exposure.
Test your knowledge on the factors affecting exposure and dose in radiography with this quiz. From changes in mA to kilovoltage control, this quiz covers everything you need to know about how exposure and dose are affected in radiography. See how much you know about the primary controllers of radiographic density and contrast, and learn about the effects of source-image receptor distance on x-ray beam intensity and exposure. Sharpen your knowledge on radiography with this informative quiz.
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