Radiography Exposure and Dose

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Questions and Answers

What is the primary controller of radiographic density in radiography?

  • mAs (correct)
  • SID
  • mA
  • kVp

What happens to exposure if the mA is doubled?

  • It remains the same
  • It doubles (correct)
  • It is quadrupled
  • It is halved

What is the effect of increasing kVp in radiography?

  • Increases contrast
  • Decreases contrast
  • Increases density (correct)
  • Decreases density

What is the primary controller of radiographic contrast in radiography?

<p>kVp (A)</p> Signup and view all the answers

What is the product of mA and exposure time in radiography?

<p>mAs (C)</p> Signup and view all the answers

What is the effect of doubling the exposure time in radiography?

<p>Doubles the dose and exposure (C)</p> Signup and view all the answers

What is the effect of doubling or halving the kVp in radiography?

<p>Extreme changes in exposure (C)</p> Signup and view all the answers

What is the distance between the tube target and the IR called in radiography?

<p>SID (B)</p> Signup and view all the answers

What is the effect of a longer SID in radiography?

<p>Decreases the intensity of the x-ray beam (D)</p> Signup and view all the answers

What is the primary controller of radiographic density in radiography?

<p>mAs (A)</p> Signup and view all the answers

What happens to exposure if the mA is doubled?

<p>It doubles (B)</p> Signup and view all the answers

What is the effect of increasing kVp in radiography?

<p>Increases density (D)</p> Signup and view all the answers

What is the primary controller of radiographic contrast in radiography?

<p>kVp (B)</p> Signup and view all the answers

What is the product of mA and exposure time in radiography?

<p>mAs (A)</p> Signup and view all the answers

What is the effect of doubling the exposure time in radiography?

<p>Doubles the dose and exposure (D)</p> Signup and view all the answers

What is the effect of doubling or halving the kVp in radiography?

<p>Extreme changes in exposure (C)</p> Signup and view all the answers

What is the distance between the tube target and the IR called in radiography?

<p>SID (B)</p> Signup and view all the answers

What is the effect of a longer SID in radiography?

<p>Decreases the intensity of the x-ray beam (A)</p> Signup and view all the answers

Which factor is the primary controller of radiographic density?

<p>mA (C)</p> Signup and view all the answers

What is the effect of doubling the exposure time in radiography?

<p>Doubles the dose and exposure (A)</p> Signup and view all the answers

What is the effect of doubling the mA in radiography?

<p>Doubles the exposure and dose (D)</p> Signup and view all the answers

What is the primary controller of the penetration of x-rays in radiography?

<p>kVp (B)</p> Signup and view all the answers

What is the effect of changing the kVp in radiography?

<p>Affects the quantity of exposure to the IR (B)</p> Signup and view all the answers

What is the relationship between mAs and patient dose in radiography?

<p>Directly proportional (C)</p> Signup and view all the answers

What is the effect of doubling or halving the kVp in radiography?

<p>Extreme changes in exposure (A)</p> Signup and view all the answers

What is the primary controller of radiographic contrast in radiography?

<p>kVp (C)</p> Signup and view all the answers

What is the effect of increasing the SID in radiography?

<p>Decreases the intensity of the x-ray beam (C)</p> Signup and view all the answers

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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.

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