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Radiology · single question

Increasing the kVp (kilovoltage peak) of an x-ray exposure will:

  1. Have no effect on the image
  2. Increase density and decrease contrast (longer gray scale)
  3. Increase contrast and shorten the gray scale
  4. Decrease density and increase contrast
Show answer and explanation

Correct answer: B. Increase density and decrease contrast (longer gray scale)

  • A. Incorrect – kVp strongly affects density and contrast.
  • B. Correct – higher kVp gives a more penetrating beam → greater overall density (darker) and lower (longer-scale) contrast with more shades of gray.
  • C. Incorrect. That describes lowering kVp; raising kVp lengthens the gray scale (lower contrast) and increases overall density.
  • D. Incorrect – that is the effect of LOWERING kVp.

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